)
)
Consultant billing software: summary & key takeaways
Four layers, four jobs: Invoicing apps, accounting suites, time-and-billing tools and professional services automation (PSA) platforms cover different parts of quote to cash.
Margin goes before the invoice: Consultancies lose it when worked hours go unbilled and fixed fees come from the rate card.
Realization is the test: Divide what you billed by the standard-rate value of hours worked.
Fit the tool to the firm: Independents need light tools; firms with role-based rates and several SOWs need a PSA.
The best consultant billing software for a consultancy of 50 to 500 people shows what each engagement earned as well as what it billed. Most tools turn approved hours into an invoice quickly, but far fewer show realization. Realization is the share of worked hours, valued at standard rates, that you actually bill.
Before I joined Teamwork.com, I managed client accounts at creative communications firms, where manual client reporting ate hours every week that never reached an invoice. That taught me unbilled time hides in the admin around delivery, which a tool that only formats invoices never sees.
The gap costs more as fees move away from the hour toward fixed and outcome-based billing models. McKinsey's UK, Ireland and Israel managing partner told Business Insider that about a quarter of McKinsey's global fees come from outcome-based pricing. A fixed fee only pays off when it's priced from what comparable engagements cost, so pricing deserves as much scrutiny as invoicing.
We've put Teamwork.com first because it's our platform, and each tool, ours included, is tagged by its layer: PSA, time and billing, invoicing or accounting.
What is consultant billing software?
Every tool here shares one job: consultant billing software turns an engagement's hours, expenses and agreed fees into accurate client invoices. Lighter tools stop at the invoice, while fuller platforms also price the work, approve time and report margin per engagement.
A PSA, or professional services automation platform, connects engagements, people and financials in one system. Gartner describes PSA platforms as supporting services firms from planning through delivery, including resource management, reporting and billing. Whichever layer you buy, good billing software answers four questions for every engagement:
Which approved hours and expenses are ready to bill this week?
Which rate applies to each person, role and client?
How much of the fixed fee has the engagement already used?
What did the engagement earn once write-offs were counted?
How we selected these tools
We judged each tool on those four questions for a 50 to 500 person firm, using public product information, pricing pages, documentation and verified reviews.
Rates by role: Applies separate billable and cost rates by role, person and client.
Time approvals: Adds a sign-off step and reminds consultants about missing timesheets.
Engagement budgets: Tracks fixed-fee, time-and-materials (T&M) and retainer budgets against actual hours.
Realization and margin reporting: Compares what was billed with the value and cost of the hours worked.
Quoting from actuals: Prices new SOWs from what comparable engagements cost, not from the rate card alone.
Accounting sync: Passes invoices or billable lines to QuickBooks or Xero, so finance keeps the ledger.
Adoption: Gives consultants somewhere they'll log time daily, because reporting is only as good as the hours behind it.
I gave pricing as much weight as invoicing, because on my client accounts requests kept growing inside fees with no way to recover the cost. Most of that started at the pitch, where fees were set low to win. A tool that can't show what similar engagements cost leaves that problem in place.
Quick glance: 8 tools sorted by billing layer
Against those criteria, the two PSAs, Teamwork.com and BigTime, connect budgets and approvals to the invoice in one system. The other six each cover one main layer of quote to cash, and several add approvals or profitability reporting on higher plans.
Tool
Teamwork.com
)
Teamwork.com is the agentic PSA that connects the quote, the hours and the invoice for every consulting engagement. Profitability reporting shows which past engagements and clients earned most, so you price the next quote from role-based rates and that record. You then capture and approve time against that price. Realization and margin stay visible while the engagement runs, and billing passes to QuickBooks or Xero.
Best for: Consultancies of 50 to 500 people running fixed-fee and T&M engagements across several roles.
Price the next SOW from what similar engagements cost. Rate-card fixed fees assume the engagement runs to plan, so overruns come out of margin. Quoting & Costing Work builds the quote from cost and billable rates by role, project or client, so nothing is re-entered when the client accepts. An accepted quote converts into an engagement with its budget attached, so the SOW starts from what the work costs.
Catch unlogged hours before they become write-offs. Hours logged late, or never logged, are where realization slips first. Time Tracking puts timers and timesheets on the tasks consultants already work in, with reminders when a timesheet is missing. Time approvals let a practice lead sign off each week's entries before billing, and every approved hour carries its billable and cost rate.
See what each engagement earns before you bill it. A fee can look healthy while the hours behind it ran past scope. Budgeting & Profitability tracks fixed-fee, T&M and retainer budgets against approved time, with margin targets and threshold alerts. Its profitability report compares fee with cost per engagement while it's live, and invoices built from logged time sync to QuickBooks or Xero.
SugarCRM unified projects, time tracking and billing in Teamwork.com. The result was near-perfect invoicing accuracy, with less than $20K credited on more than $10M in annual invoicing. Teamwork.com also holds a 4.4/5 rating from 1,214 reviews on G2.
"Teamwork feels like it was built for teams that work with clients, not just for moving tasks from one column to another. Time tracking, budgets, workload planning, and profitability are all part of the daily workflow instead of feeling like features that were bolted on later." — Omar S., Project Manager, G2
Limitations: Quotes, role-based and client rates, and profitability insights sit on Optimize, which is priced through sales. Building invoices from logged time needs Accelerate or above. Firms moving from spreadsheets face a learning curve, so plan a structured rollout.
Pricing:
Free: $0 (max 5 users, up to 5 projects, log time)
Basics: $9.99/user/month (billed yearly, min 3 users)
Accelerate: $24.99/user/month (billed yearly, min 5 users)
Optimize: Contact sales
Enterprise: Contact sales
Annual billing saves 29%; compare current plans. Together, the three steps answer the question an invoice can't: whether the engagement made the money its price promised.
BigTime
)
BigTime is a PSA built around time, expense and billing for professional services firms. It suits consultancies that already run QuickBooks and want billing data flowing into it.
Best for: Firms that want time, billing and accounting sync from one vendor.
Essentials covers time and expense, billing and invoicing, and a QuickBooks integration, so one tool replaces a separate timer and invoicing app. Premier adds multi-currency invoicing, custom cost and rate management, project budgeting and multi-level approvals.
Those realization controls sit on Premier, and its price isn't published, so request a quote at your real headcount early. Quoting isn't mentioned in the published plan details, so ask how it prices new engagements.
Pricing:
Essentials: From $20/user/month (billing cadence not listed)
Advanced: Pricing available on request
Premier: Pricing available on request
Enterprise: Pricing available on request
Harvest
)
Harvest is a time tracking and invoicing tool that turns logged hours into invoices with little setup. It suits consultancies whose main billing problem is hours that never get recorded.
Best for: Hourly engagements where getting consultants to log time matters most.
Harvest asks little of consultants, and every hour they skip logging is an hour you can't bill. Enterprise adds timesheet approvals and profitability reporting, and our guide on how to track billable hours covers the habits that go with it.
The Teams plan adds usage-based charges for extra invoices, projects, clients and tasks, so model your real volume first. Its strength is capture rather than pricing, so check how far its budgets go for fixed fees.
Pricing:
Free: $0 (1 seat, 2 projects, time tracking, invoicing)
Teams: $9/seat/month (billed annually; $11/seat/month billed monthly), plus usage-based charges
Enterprise: $14/seat/month (billed annually; $17.50/seat/month billed monthly)
Enterprise Plus: Custom pricing
FreshBooks
)
FreshBooks is invoicing and accounting software for small businesses, priced per account with a fee per team member. It suits small consultancies that want proposals, retainers and invoices next to their books.
Best for: Small consultancies with up to 50 active clients.
If a handful of people handle all your billing, FreshBooks keeps invoices, payment reminders and the books in one record. Plus adds retainers and proposals, and Premium adds project profitability, so you see whether an engagement covered its costs without a spreadsheet.
Each team member adds $11 a month, so costs climb with headcount. At firm scale, check whether its profitability view handles role-based rates and timesheet approvals.
Pricing:
Lite: $23/month (monthly list price; 5 billable clients)
Plus: $43/month (monthly list price; 50 clients, retainers, proposals)
Premium: $70/month (monthly list price; unlimited clients, project profitability)
Select: Custom pricing
Team members: $11/month per user add-on
QuickBooks Online
)
QuickBooks Online is accounting software that keeps the ledger, accounts receivable and invoicing for small and midsize businesses. It suits consultancies that need a trusted finance system of record.
Best for: Finance teams that want the books, AR and tax in one widely supported ledger.
Essentials adds employee time to invoices, and Plus adds project profitability tracking, so finance sees revenue and cost by project. BigTime and Teamwork.com both sync to it, which makes it a safe home for the ledger.
Advanced tops out at 25 users, so at a firm of 50 to 500 people most consultants log time elsewhere. Its project profitability reflects what reached the books, so write-offs surface after delivery rather than during it.
Pricing:
Simple Start: $38/month (monthly list price; 1 user)
Essentials: $85/month (monthly list price; 3 users)
Plus: $140/month (monthly list price; 5 users)
Advanced: $340/month (monthly list price; 25 users)
Xero
)
Xero is cloud accounting software with quotes, invoicing and the ledger in one subscription. It suits consultancies that bill clients in several currencies.
Best for: Firms that need the ledger plus multi-currency invoicing.
Established tracks time and costs for projects and handles multi-currency, so international billing and the books stay in one system. Early includes quotes, which gives a very small team a simple path from price to invoice.
Before you treat Xero as your realization source, check whether its project tracking covers role-based rates, time approvals and fixed-fee budgets. Early also allows 20 invoices, which a growing firm passes quickly.
Pricing:
Early: $27/month (monthly list price; quotes and 20 invoices)
Growing: $59/month (monthly list price)
Established: $97/month (monthly list price; multi-currency, track time and costs for projects)
Zoho Invoice
)
Zoho Invoice is free invoicing software with recurring invoices, payment reminders and a client portal. It suits independent consultants and very small teams.
Best for: Independents and two-person practices that need professional invoices at no cost.
Automatic reminders and a client portal handle the chasing. That matters: the Federal Reserve's Small Business Credit Survey found US professional services firms more likely than many other industries to report slow-paying customers. For a solo practice, faster collection is the first problem worth solving.
The free plan stops at 2 users, 3 projects and 500 invoices a year, with Zoho Invoice branding on every invoice. Realization and fixed-fee budgets need another tool.
Pricing:
Free: $0 (up to 2 users, 3 projects, 500 invoices per year)
Clockify
)
Clockify is a low-cost time tracker with timesheets and billing on its paid tiers. It suits firms that need every consultant logging time without a large per-seat bill.
Best for: Large teams feeding cheap, consistent time capture into a separate billing system.
Standard adds timesheeting and billing for $5.49 a seat billed annually, so a large firm can put a timer in front of everyone cheaply. Our roundup of time tracking software for consultants compares it with other capture tools.
Clockify is a capture layer first. Check whether its reports compare a fixed fee with the cost of the hours behind it, since that tells you whether the fee paid off.
Pricing:
Free: $0 (up to 5 users)
Basic: $3.99/seat/month (billed annually; $4.99 billed monthly)
Standard: $5.49/seat/month (billed annually; $6.99 billed monthly)
Pro: $7.99/seat/month (billed annually; $9.99 billed monthly)
Enterprise: $11.99/seat/month (billed annually; $14.99 billed monthly)
How to tell which billing layer your consultancy needs
Knowing whether a fee paid off starts with where money slips away: the invoice, the ledger, time capture or the price. Run this billing layer test before you book a demo:
Choose an invoicing app when: one or two people price, deliver and bill, and engagements are hourly at a single rate.
Choose accounting software when: your gap is the ledger, AR and tax, and accurate hours already arrive from elsewhere.
Choose a time-and-billing tool when: consultants bill by the hour and the problem is hours that never get logged.
Choose a PSA when: you run fixed fees across several roles and SOWs and need realization before the invoice.
Your billing model narrows the shortlist, and our guide to project billing software matches tools to each model. For a consultancy moving toward fixed fees, the deciding number is realization on engagements you've already delivered.
Fixed-fee realization check
Say your firm signs a $120,000 fixed-fee SOW scoped at 600 hours, at a $200 blended rate. The team logs 720 approved hours to finish it. Assume every hour is billable work on this SOW, $200 is the standard-rate value of an hour and expenses sit outside the fee.
Realization divides the fee by the standard-rate value of the hours worked, here 720 hours at $200 each:
That's 83.3% realization, so $24,000 of worked value at rate card never reached the invoice. Your earned hourly rate is the fee spread across the hours actually worked:
The team earned about $167 an hour against a $200 rate card. An invoicing app records a clean $120,000 and flags nothing. A tool tracking burn against approved hours shows the engagement passing 600 hours, while a change order is still possible.
The next SOW is where the check pays off. Price similar work from 720 hours at $200 and the fee becomes $144,000. Hold it at $120,000 and you're accepting 83.3% realization in advance.
AI raises the stakes on that arithmetic. SPI Research's 2026 Impact of AI on Professional Services report models a 100-person PS organization at 67.8% utilization. Every 10% of T&M effort AI removes puts about $1.9mm of revenue at stake, unless the work is repriced or the hours are sold again. If AI is shortening your engagements, price them from actuals and run this check on each one.
I'd check one thing in every demo: whether logged hours and the engagement plan live in the same record. A plan kept apart from the hours can't stay current, so the realization check runs on numbers nobody fully trusts.
None of this means every firm needs a PSA. If one partner prices, delivers and bills, or every engagement is hourly at one rate, an invoicing app plus accounting software covers you. Run the check by hand in the project profitability tracking template first, and if realization looks healthy, a lighter tool is enough.
Why Teamwork.com stands out for consulting firms
Once realization matters on every engagement, you need it calculated as consultants log time, and that's where Teamwork.com stands out. Project tools track the work but can't manage the money. Traditional PSAs manage the money, but teams resist using them, so the hours going in are incomplete.
Teamwork.com gives you PSA-grade financials in a platform your consultants actually want to log time in. That adoption matters more than any report, because rates, approvals and margin are only as accurate as the timesheets underneath them.
Your CRM keeps the pipeline and your accounting system keeps invoicing, AR and the ledger. Teamwork.com owns delivery in between and passes what to bill to your finance system, so your close process stays as it is. See how that setup is built for consulting firms.
Knowing what an engagement really cost gives you a choice on the next SOW. Price it the same and keep the margin, or price it sharper and win engagements other firms can't afford to take at that fee.
)
)
)
)
)
)
)