The six best accounts receivable software tools for law firms in 2026 are Paidnice, Chaser, Upflow, Kolleno, Bill.com and Invoiced, ranked on chasing operating invoices from the firm's existing ledger without touching trust money.
None of the six replaces Clio, MyCase, CosmoLex or LeanLaw, which hold the matter, the time, the trust ledger and the bill. The tools ranked here sit on the Xero or QuickBooks Online ledger the practice system posts to and take over once the operating invoice falls overdue. Prices from $49 per user a month, checked in September 2026.
Lockup is days of annual revenue sitting in unpaid bills; Clio puts top-quartile firms at 19 days or fewer and bottom-quartile firms above 90. Clio Legal Trends · Intuit 2026 Late Payments Report
Tools are ranked on whether they layer on the existing ledger, stay off trust money, set interest by client group, publish a dollar price and hold a verified review record, in that order.
Trust accounts first: what AR automation must never touch
Any AR tool a law firm adds must chase operating invoices only. Client trust funds are never commingled with firm money and never debited for processing fees, chargebacks or interest.
Clio keeps client funds separate from operating funds "in compliance with trust accounting and IOLTA regulations," protected from third-party debiting including processing fees and chargebacks. LeanLaw states that client funds must never be commingled and that each state sets its own IOLTA rules. CosmoLex adds that card processing fees cannot be taken from client accounts.
- Xero and trust
- Xero integrates with Actionstep, Clio Manage, LEAP and Smokeball but describes itself as not designed for tracking client trust funds. Trust stays in the legal layer
- QuickBooks Online and trust
- Not preconfigured for trust accounting; the IOLTA structure is built manually or through a legal layer such as LeanLaw, with monthly three-way reconciliation under state bar rules
- Fees on legal bills
- ABA Model Rule 1.5 requires reasonable fees, generally in writing, with unearned advances held in trust. Interest on overdue invoices is set state by state. ABA, Family Advocate, Winter 2026
- Collections agencies
- The FDCPA governs third-party collection of consumer debt only. An agency chasing an individual client is covered; a business client is not. CFPB
Best accounts receivable software for law firms
Paidnice and Chaser compute and post late fees themselves. Upflow and Kolleno are mid-market platforms priced above most small and mid-size firms. Bill.com and Invoiced are US invoice-to-cash products with reminders and no verified late fee.
 |
 |
 |
 |
 |
 |
|
|---|---|---|---|---|---|---|
| Revenue fit | $1m to $20m | £4m and under on the entry tier, tiers to £200m | Gross invoice value bands, under $10m to over $100m | $1m turnover and above | Not published | Not published |
| From (monthly) | $69 | £199 | Not published | €650 per user | $49 per user | Not published |
| Layers on Xero or QuickBooks Online | Yes, both | Yes, both | Yes, both (QuickBooks polled every 5 minutes) | Yes, both on the two lower tiers | Two-way from the Team tier; CSV only on Essentials | Yes, integration pages maintained |
| Late fees and interest | Yes (per client group, posted to the ledger) | Yes (one global rule) | ERP-side only | None found | No | Not documented |
| Reminder channels | Email, SMS | Email, SMS, letters, calls | Email, SMS, letters; once daily, weekdays | Email, SMS, calls | Email; max 3 templates company-wide | Not documented |
| Statements | Yes, scheduled, incl. consolidated parent accounts | Yes, monthly on a fixed day | Not documented | Yes, in the portal | No | Not documented |
| Payment plans | Yes | Yes (chasing follows the invoice date) | No (promises to pay only) | Yes | No | Not documented |
| Legal-system integration | None named; via the ledger | None named; via the ledger | None named; via the ledger | Clio listed among CRM integrations | None named; via the ledger | None named; via the ledger |
| Rated | 5.0, 83 Xero App Store reviews | 4.98, 374 Xero App Store reviews | 4.8, 233 G2 reviews | 4.9, 99 G2 reviews | 4.4, 1,806 G2 reviews | Not documented |
| Last verified | September 2026 | September 2026 | September 2026 | September 2026 | July 2026 | July 2026 |
"Not documented" means the vendor does not document the capability. "Not published" means the vendor does not print a price. "None found" means no evidence either way.
1. Paidnice
Best for firms on Clio, MyCase, CosmoLex or LeanLaw that post to Xero or QuickBooks Online and bill $1m to $20m a year
What is it best for?
A firm whose practice system already issues the bill and wants reminders, statements and interest to run from the operating ledger, with different rules for different client groups.
- Fits
- Firms on Xero or QuickBooks Online from about $500k in fees, sweet spot $1m to $20m
- Regions
- United States, Canada, United Kingdom, Australia, New Zealand, South Africa
- Entry cost
- $69/mo on Essentials, 150 invoices, 600 emails, up to 2 team members; Pro from $99/mo with unlimited users and no per-seat fee. As at September 2026, verify current pricing
- Rated
- 5.0 from 83 Xero App Store reviews; 4.9 from 14 on Capterra; 4.7 from 29 on Trustpilot, read in September 2026
- Awards
- Winner, New Zealand Small Business App of the Year, Xero Global App Awards 2026; 2025 Xero Global Small Business App of the Year
- Runs on
- Xero, QuickBooks Online, Stripe, Pinch Payments, HubSpot, Pipedrive, Zapier. NetSuite, Sage Intacct and Dynamics 365 Business Central on the Custom plan only
- Statutory late fees
- Yes. An invoice late fee per overdue bill and a statement interest charge per client on the whole overdue balance, both raised on the ledger as Draft or Approved, with policies under client groups
- Does best
- Chasing the operating invoice from the ledger while the practice system keeps the matter, the time and the trust ledger
Paidnice reads the invoices the practice system posts into Xero or QuickBooks Online and runs the follow-up from there: reminder sequences per client group by email and SMS, scheduled statements including consolidated statements for a parent company with several matters, payment plans, and a client payment portal. It can send the invoice document already attached to the ledger record, so the client sees the bill the firm's own system produced.
The client-group design matters for legal billing. A firm that states interest on commercial bills but not on family-law bills runs an interest policy on the first group and none on the second. A disputed bill is excluded by its reference without switching the client off.
Escalations fire at a set number of days overdue or on a client's total overdue balance, with instructions emailed to a named person. Paidnice reports that customers cut their average wait for payment in half, within 30 days.
Limitations with Paidnice. No legal-specific integration and no trust-accounting awareness: the firm keeps trust transactions off the operating ledger it reads, and nothing in Paidnice checks that for you.
- Xero and QuickBooks Online only; a practice system posting to Sage or NetSuite needs the Custom plan.
- No bureau credit check.
- Capterra reviewers describe the interface as "still a bit clunky and not intuitive enough" at setup.
2. Chaser
Best for larger firms that want multi-channel chasing and credit checks in one established tool, up to £4m turnover on the entry tier
What is it best for?
An established firm with a billing team that wants email, SMS, letter and call reminders plus Creditsafe credit reports on commercial clients, on a turnover-tiered plan.
- Fits
- Firms up to £4m turnover on Compact, £10m on Core, £200m on Complete
- Regions
- UK-founded, sold internationally; auto-calls unavailable in New Zealand
- Entry cost
- £199/mo (about $259) on Compact, 4 users, 4 schedules, 100 SMS and 100 call credits; Core £599, Complete £899. Demo required to buy.
- Rated
- 4.98 from 374 Xero App Store reviews; 4.5 from 68 on G2; 4.9 from 45 on Capterra
- Awards
- Xero App Partner of the Year 2023
- Runs on
- Xero, QuickBooks, Sage 50/200/Intacct, NetSuite, Dynamics 365, HubSpot, Gmail and Outlook
- Statutory late fees
- Yes. Four calculation types, recalculated daily, as one global rule that cannot vary by schedule or client group; no fees on payment-plan or partially paid invoices; line-item sync to Xero only
- Does best
- Channel breadth: email from the firm's own mailbox, SMS, letters, automated and recorded calls, plus Creditsafe credit checks and Debitura collections
Chaser has chased invoices since 2014 and carries the largest review base in the category. For a firm with a billing team the appeal is one tool covering every channel: reminders send from the firm's own Gmail or Outlook inbox, letters and SMS are credit-metered, and Core adds recorded in-app calls. Credit checks through Creditsafe surface director and filing data on commercial clients.
Late fees are computed daily and post to Xero as line items. The rule is global: every client gets the same fee treatment, so a firm whose engagement letters differ by practice area manages that outside the tool. Statements go out monthly on a fixed day.
Limitations with Chaser. The single global late-fee rule is the sticking point for a firm whose engagement letters differ by practice area.
- Priced by company turnover in pounds, and a demo is needed before purchase.
- Payment-plan chasing follows the original invoice date rather than the installment dates.
- Fee line items sync to Xero only; a QuickBooks Online firm records the fee by hand.
3. Upflow
Best for firms with a finance lead who wants collections analytics and cash forecasting more than late fees, on a quote-only plan
What is it best for?
A multi-office firm with a controller who wants DSO, at-risk balances and collection effectiveness on a dashboard, with unlimited seats.
- Fits
- Five tiers by annual gross invoice value, under $10m to over $100m
- Regions
- New York HQ, Paris origin; 500+ customers in 30+ countries claimed
- Entry cost
- Not published; every tier is quote-only. 2024 third-party captures showed $440 and $880 a month. Payments add-on $390/mo plus card 3.5% + $0.30 and ACH 0.8% capped at $5.
- Rated
- 4.8 from 233 on G2; 4.5 from 15 on Capterra; 5.0 from 1 Xero App Store review
- Awards
- None found
- Runs on
- QuickBooks (one-way, polled every 5 minutes), Xero, NetSuite, Sage Intacct, Stripe Billing, Chargebee, Zuora
- Statutory late fees
- ERP-side only. No native computation; the documented route applies fees in NetSuite
- Does best
- Receivables analytics: countback DSO against best possible DSO, collection effectiveness, at-risk rate, cohort cash forecasting
Upflow is built around the analytics a finance lead reads rather than the charge a billing clerk posts. Workflows send email, SMS and letters, tasks assign calls, and a branded portal takes card, ACH and direct-debit payments with autopay. AI detects promises to pay and dispute signals in client replies.
Automatic actions fire once a day on business days only, which suits a firm that does not want a client emailed on a Saturday.
Limitations with Upflow. No price is printed at any tier, and no late fee is computed inside the tool.
- QuickBooks Online payments land in Undeposited Funds and need manual reconciliation.
- No scheduled payment plans; promises to pay and ad-hoc partial payments only.
- One Xero App Store review is too few to weigh.
4. Kolleno
Best for firms above $10m that want AI-driven collections and cash application, and can pay per user
What is it best for?
A large firm or legal group on NetSuite, Sage Intacct or Xero that wants autonomous collections agents, remittance matching and a listed Clio integration, priced per seat.
- Fits
- BusinessPay above $1m turnover, Business Plus above $10m, Enterprise above $100m
- Regions
- London HQ; geo-currency pricing display
- Entry cost
- €650 per user a month on BusinessPay (€545 annual); Business Plus €1,245 per user, two-user minimum. A US buyer should ask for the dollar figure.
- Rated
- 4.9 from 99 on G2; 5.0 from 8 on Capterra; 5.0 from 18 Xero App Store reviews
- Awards
- G2 Best Software Awards 2024
- Runs on
- Xero, QuickBooks Online and Sage Intacct on the lower tiers; NetSuite, SAP, Dynamics 365, Oracle on Enterprise; Clio listed among CRM integrations
- Statutory late fees
- None found. No feature page or help article documents a late fee or interest function
- Does best
- Cash application: remittance parsing, bank-file matching, credit-note offsets, with an AI agent running collections policy
Kolleno is the only tool of the six that names Clio on an integration page. It runs trigger-based workflows by email, SMS and call, a branded portal with saved payment methods, payment plans split weekly or monthly, and a three-tier AI stack that scores payment likelihood, drafts messages for review and, on the Agent tier, runs collections without a person.
The product has moved upmarket from small-business credit control to enterprise order-to-cash, and a three-person billing team on BusinessPay is €1,950 a month before add-ons.
Limitations with Kolleno. Per-user pricing at €650 a seat puts it out of reach for most firms under $10m, and no late-fee function was found.
- Custom-domain email setup is account-manager assisted.
- G2 reviewers call navigation unclear at times and reporting less customizable than they want.
- The Clio listing was not tested for this page; ask what it syncs.
5. Bill.com
Best for firms already running payables through Bill.com that want basic invoice reminders and ACH collection in the same login
What is it best for?
A firm whose bookkeeper already pays vendors through Bill.com and wants three reminder emails and ACH or card acceptance on operating invoices without another tool.
- Fits
- Not published by revenue; per-user tiers from one seat
- Regions
- United States
- Entry cost
- $49 per user a month on Essentials (CSV sync only); $65 on Team for two-way QuickBooks Online and Xero sync; $89 on Corporate. Plus ACH $0.59 a transaction, cards 2.9%.
- Rated
- 4.4 from 1,806 on G2; 4.1 from 562 on Capterra; "Poor" at 1.8 to 2.0 from about 1,600 on Trustpilot
- Awards
- None found for the AR product
- Runs on
- CSV on Essentials; QuickBooks Online and Xero two-way from Team; NetSuite, Intacct, Dynamics and Acumatica on Enterprise
- Statutory late fees
- No. Only fees created in QuickBooks Desktop sync in
- Does best
- Payment rails inside the invoice workflow: ACH, card, auto-charge and a payment link that needs no portal
Bill.com is a payables platform first, and receivables is the add-on. For a firm already using it for vendor bills, AR means invoice templates, a client portal, payment links, and up to three automated reminder templates set company-wide, off by default, at 30, 60 and 90 days after due.
Reminders cannot be timed differently for one client and fire to every contact on any invoice with a balance, including partially paid ones.
Limitations with Bill.com. The AR feature set stops at three reminders, and reviewers call it "the most basic, bare bone features."
- Essentials syncs by CSV only; two-way ledger sync starts at $65 a user.
- Transaction fees sit on top of the seat price.
- No late fees, no statements, no payment plans, no AR-side AI.
6. Invoiced
Best for mid-market firms on NetSuite, Intacct or Business Central that want a US invoice-to-cash platform with a documented late-fee use case
What is it best for?
A larger firm with an ERP rather than a small-business ledger, evaluating an enterprise invoice-to-cash platform that still maintains Xero and QuickBooks integration pages.
- Fits
- Not published; positioning is mid-market to enterprise
- Regions
- United States
- Entry cost
- Not published. The vendor does not publish a price
- Rated
- Not documented. The vendor does not publish a review count
- Awards
- None found
- Runs on
- NetSuite, Sage Intacct, Dynamics 365 Business Central; Xero and QuickBooks Online, Desktop and Enterprise integration pages maintained
- Statutory late fees
- Not documented. A dedicated late-fee automation use-case page exists; the mechanics were not confirmed
- Does best
- ERP-grade invoice-to-cash for firms already on NetSuite or Intacct, now part of Flywire
Invoiced is a US invoice-to-cash platform, now owned by Flywire, whose positioning has moved toward the enterprise: gated white papers, persona pages for the CFO and controller, ERP integrations at the front. It keeps integration pages for Xero and every QuickBooks edition and publishes a late-fee automation use case.
Because the vendor does not document pricing, review counts or fee mechanics, the entry is placed last.
Limitations with Invoiced. Nothing that decides a purchase is printed: no price, no revenue band, no verified review record.
- The enterprise pivot deprioritizes the Xero and QuickBooks Online audience its integration pages serve.
- Ask for the price sheet before a demo.
Legal billing software vs accounts receivable software
Clio, MyCase, CosmoLex and LeanLaw issue the bill, hold the trust ledger and send a basic reminder. The tools ranked above pick up after that: sequenced chasing, statements, interest and escalation on the operating invoice, read from the ledger.
Clio sends automated payment reminders from customizable templates. LeanLaw markets trust-replenishment reminders when a retainer runs low, plus invoice reminders with read receipts. CosmoLex is described in its marketing as scheduling overdue reminders by email or text. None documents per-group chasing, a statement cycle the firm controls, or an interest charge posted to the ledger.
| Job | Billing layer (Clio, MyCase, CosmoLex, LeanLaw) | AR layer (the six above) |
|---|---|---|
| Matter, time, expenses, bill | Yes | No; reads the posted invoice |
| Trust ledger, IOLTA, three-way reconciliation | Yes | No; must be kept off trust |
| First reminder email | Yes | Yes |
| Sequenced chase per client group, SMS | Not documented | Paidnice, Chaser, Upflow, Kolleno |
| Interest or late fee posted to the ledger | Not documented | Paidnice, Chaser |
| Scheduled statements | Not documented | Paidnice, Chaser, Kolleno |
| Escalation to a named person or agency | Not documented | Paidnice, Chaser, Upflow, Kolleno |
Which tools apply late fees and interest on legal bills
Paidnice and Chaser compute and post a charge themselves. Upflow defers to the ERP. Kolleno, Bill.com and Invoiced document none. Whether the firm may charge at all depends on the engagement letter, the bill and the jurisdiction.
In the United States, ABA Model Rule 1.5 requires a reasonable fee generally set out in writing, and interest on overdue invoices is governed state by state. If the engagement letter and the bill do not state that interest is payable and at what rate, do not let software add one.
New South Wales writes that into statute. Under the Legal Profession Uniform Law s195 (AustLII), a practice may charge interest on costs unpaid 30 days or more after the bill was given, only if the bill states interest is payable and discloses the rate, at no more than the Cash Rate Target plus 2 percentage points.
In the UK, SRA Accounts Rule 7 covers interest the firm owes clients on money it holds and says nothing about interest on the firm's own overdue bills. SRA Accounts Rules A firm with commercial clients on stated-interest terms and individual clients on none needs per-group rules: Paidnice runs them under client groups; Chaser runs one global rule, so the firm charges everyone or no one.
Which tools offer payment plans
Paidnice, Chaser and Kolleno offer installment plans on an invoice. Upflow and Bill.com do not, and Invoiced does not document them. A plan on the operating invoice keeps the matter moving without touching the retainer.
- Paidnice runs plans through Stripe or Pinch with deposits, installments and auto-pay; reminders follow the plan.
- Chaser splits an invoice weekly to yearly, but chasing follows the original due date rather than the installment dates. Not on trial, Custom or Care.
- Kolleno splits weekly, monthly or bi-monthly with plan-linked automations; no interest or deposit option is documented.
- Upflow offers client-initiated partial payments and promises to pay, not a scheduled plan.
- Bill.com offers recurring invoices with auto-charge only.
Accounts receivable automation software professional services firms 2026
Under $1m in fees, the billing layer's own reminders plus a $69 ledger tool cover it. From $1m to $20m, Paidnice or Chaser. Above $10m with a finance function, Upflow or Kolleno enter the frame. Bill.com fits a firm already on it for payables.
| Annual fees | Start with | Why |
|---|---|---|
| Under $1m | Practice-system reminders; Paidnice Essentials if the ledger is Xero or QuickBooks Online | $69 a month covers 150 invoices and 2 users |
| $1m to $4m | Paidnice; Chaser Compact if a billing team wants letters, calls and credit checks | Chaser's entry tier caps at £4m turnover; Paidnice tiers by invoice count |
| $4m to $20m | Paidnice Pro; Chaser Core; Upflow if analytics lead the brief | Chaser Core covers to £10m with unlimited users; Upflow bands by gross invoice value |
| $20m and above | Kolleno Business Plus; Upflow Scale; Invoiced for an ERP firm | Per-user or quote-only pricing, ERP connectors, cash application |
Best AR automation software for professional services
The same test applies to accounting firms, consultancies and agencies: the project system issues the bill, the ledger holds it, the AR layer chases from the ledger. Choose by ledger first, then by whether interest is stated on the engagement terms.
- Xero
- Paidnice and Chaser post fees to Xero; Kolleno and Upflow connect on their lower tiers; Bill.com from Team. Xero's own reminders stop at five per organisation, with no SMS and no scheduled statements
- QuickBooks Online
- Paidnice posts fees to the QuickBooks ledger; Chaser's fee line items sync to Xero only; Upflow polls one-way every five minutes. QuickBooks itself allows three email reminders and late fees that are not retroactive. QuickBooks for Legal exists, but no documented late-fee automation was found for it
- NetSuite, Intacct, Dynamics
- Kolleno and Invoiced natively; Chaser and Upflow by connector; Paidnice on the Custom plan
- Interest stated on the engagement letter
- Paidnice for per-group rules; Chaser if one firm-wide rule is acceptable
- No interest, chasing only
- Any of the six; Bill.com if payables already run there
What accounts receivable software costs law firms in 2026
Three of the six print an entry price: Bill.com at $49 per user, Paidnice at $69 on Essentials, Chaser at £199. Kolleno prints €650 per user. Upflow and Invoiced print nothing.
The pricing metric decides the bill more than the headline. Bill.com and Kolleno charge per seat, so a three-person billing team triples the subscription, and Bill.com adds $0.59 per ACH payment and 2.9% on cards. Chaser steps by company turnover. Paidnice steps by invoice volume with no per-seat fee; Upflow bands by gross invoice value with unlimited seats.
Against 32 days of lockup on a $3m practice, roughly $263,000 of billed work waiting to be paid at any moment, the subscription is the smaller number. Prices as at September 2026 unless the entry says July; verify with the vendor.
Common questions
The questions that come up while a firm is shortlisting: what software most firms use, which tool is best for billing, and where accounts receivable software sits beside it.
What is the best accounting software for a law firm?
Xero or QuickBooks Online for the ledger, with a legal layer on top, since neither handles trust accounting alone. Clio, MyCase, CosmoLex and LeanLaw are the legal layers the market converges on. The AR tools ranked here sit on that ledger rather than replacing any of it.
What is the most popular accounts receivable software?
By review count among the six, Bill.com with 1,806 G2 reviews, then Chaser with 374 on the Xero App Store and Upflow with 233 on G2. Popularity and fit differ: Bill.com caps at three company-wide reminders and has no late fees, statements or plans.
What software do most law firms use?
A practice management system for matters, time and trust, a general ledger it posts to, and a payment processor. Clio reports that invoices sent electronically with a payment link collect 17 days faster than mailed ones. AR automation is the layer most firms have not yet added.
What is the best billing software for law firms?
The one that keeps trust and operating money apart correctly for the firm's state bar, which is what Clio, MyCase, CosmoLex and LeanLaw are built for. This page does not rank them. It ranks what to run after the bill is issued.
Is there a free accounts receivable software for law firms?
Practice-system reminders come with the subscription, as do five native reminders in Xero and three in QuickBooks Online. None of the six ranked tools is free. Paidnice charges nothing for the first 20 actions; Upflow's entry tier is quote-only.
Next in this guide
QuickBooks Online
Best accounts receivable software for QuickBooks Online
What the ledger's three native reminders leave undone, and which tools finish the job.
Buyer's guide
Credit control software for Xero
The five decisions that produce a shortlist, in the order they should be taken.
Head to head
Chaser vs Paidnice
The two tools here that post a late fee themselves, compared on grain, price and channels.
Alternatives
Best Chaser alternatives
What else raises a charge, if Chaser's single global rule is the sticking point.