US · Pricing guide · Sales tax compliance
How Much Does Sales Tax Compliance Cost in the US?
Short answer
Multi-state US sales tax compliance typically costs $250–$1,500 per month in 2026, driven mainly by how many states you have economic nexus in. The work covers nexus monitoring, registrations, return preparation and filing across each state where you cross a threshold. BlackpeakCFO handles multi-state sales tax compliance from $295/month, fixed and agreed in writing.
What it costs with BlackpeakCFO
| Engagement | Price | What it covers |
|---|---|---|
| Single-state / nexus monitoring | From $295/mo | Economic-nexus tracking plus return preparation and filing for one state where you have nexus. |
| Multi-state — Core | $495–$895/mo | Nexus monitoring and filings across a handful of states, with registrations handled as you cross thresholds. |
| Multi-state — Broad | $895–$1,500/mo | Filings across many states, varying frequencies and product taxability, plus ongoing nexus review. |
| Registration & setup | Fixed one-off per state | State registrations and software setup priced as a one-off, separate from the monthly filing fee. |
All prices fixed and agreed in writing before any work starts. No hourly meter, no surprise invoices. Prices shown in USD, current as of May 2026.
What drives the price
Number of states with nexus
This is the headline driver. Each state where you have crossed an economic-nexus threshold is a separate registration, a separate filing calendar and a separate return — so cost scales directly with how many states you sell into at volume.
Filing frequency
States assign monthly, quarterly or annual filing frequencies, often based on your sales volume in that state. A monthly filer is materially more work over a year than an annual filer, and the fee reflects the real cadence.
Product and service taxability
Whether what you sell is taxable, exempt or partially taxable varies by state and adds complexity. SaaS, digital goods and mixed product lines need careful taxability mapping that simple physical-goods sellers do not.
Software and the state of your data
Clean sales data flowing from your billing or e-commerce platform into sales-tax software — Avalara, TaxJar — keeps filings efficient. Messy or manual data adds reconciliation work, and that is scoped honestly.
What you'd pay elsewhere
Sales-tax compliance costs vary sharply with footprint, and the market splits into software and service. Sales-tax software such as Avalara or TaxJar typically runs a subscription plus a per-return filing fee — often $20–$50 per return — which adds up quickly once you are filing in many states every month. Specialist sales-tax firms and accountants layer a service fee on top, commonly $50–$150 per state per filing, or a monthly retainer. Registration in a new state is usually a separate one-off cost. The genuine risk is not the fee but the gap: since the 2018 South Dakota v. Wayfair decision, crossing a state's economic-nexus threshold creates a filing obligation whether or not you noticed — and unfiled back taxes, interest and penalties cost far more than getting compliant on time.
How we price it
BlackpeakCFO handles multi-state sales tax compliance as one fixed monthly fee, from $295/month, scoped to the states you actually have nexus in and agreed in writing. The service covers ongoing economic-nexus monitoring — so you know before you cross a threshold, not after — plus return preparation and filing on each state's schedule. State registrations and software setup are quoted as a clear one-off, kept separate from the monthly fee. The work is overseen by Stuart Wilson, ACMA CGMA — a chartered management accountant and AICPA member — so sales tax stops being a quiet, growing liability and becomes a known, controlled monthly line.
Common questions about how much does sales tax compliance cost in the us?
What is economic nexus and why does it matter?
Economic nexus is the rule that you can owe sales tax in a state simply by selling enough into it — even with no office or staff there. It came from the 2018 South Dakota v. Wayfair Supreme Court decision. Most states set a threshold, commonly around $100,000 in sales or 200 transactions a year. Cross it and you must register, collect and file in that state — which is why ongoing monitoring matters.
How much does multi-state sales tax compliance cost?
It depends almost entirely on how many states you have nexus in. BlackpeakCFO starts at $295/month for single-state monitoring and filing, $495–$895/month for a handful of states, and $895–$1,500/month for a broad multi-state footprint. The fee is fixed and agreed in writing; state registrations are a separate one-off, so you can see exactly what each part costs.
Do I still need sales-tax software like Avalara or TaxJar?
Often, yes — software handles real-time rate calculation at checkout, which a service alone does not. BlackpeakCFO works alongside platforms such as Avalara or TaxJar: the software calculates and the compliance service monitors nexus, prepares and files the returns and keeps the registrations correct. The monthly fee covers that compliance work; any software subscription is billed by the software provider directly.
What happens if I have already crossed a threshold without filing?
That is common, and it is fixable — but it is a separate job from ongoing compliance. Unfiled back taxes accrue interest and penalties, and some states offer voluntary disclosure programmes that can reduce the look-back period and penalties. BlackpeakCFO will assess where you stand, quote any catch-up registration and back-filing as a fixed one-off, and then move you onto the standard monthly service.
Does this cover income tax or just sales tax?
This service covers sales and use tax — the tax on transactions — not state income tax or your federal return. Economic nexus can create state income-tax obligations too, which is a related but distinct area. BlackpeakCFO will flag where income-tax nexus may apply and coordinate with your CPA, but the fixed monthly fee here is specifically for sales-tax monitoring and filing.
Related
Get a fixed price for your business
Send your details in a one-minute form. Stuart reads every one personally and replies within one business day with a written, fixed quote — no phone call required, no obligation.
Get a fixed sales tax quote →