You paid tax you didn’t owe.

Avoir scans your software and AI invoices, finds the sales tax your vendors overcharged over the last three to four years, and gets it back. You pay 25%, only when money lands.

From your invoices to a refund

Read-only exports in. Every overcharged line out, with the evidence to claim it.

Send read-only exports – Card or AP spend, your top vendors’ invoices and headcount by state. No bank logins, no access to money.

We check every line – Each line is tagged and held to its state’s rules. Uncertain lines go to a person, not a guess.

You approve, we recover – You pick the claims and we chase the vendors. The refund goes straight to you.

Every finding carries its evidence – The invoice, the line, the rule, the amount and a confidence level.

Deadlines tracked from day one – Every state sets its own claim window. We work the soonest first.

Get back what’s already yours.

Taxing jurisdictions in the US
13,000+
Years most states let you claim back
3–4
Our fee, only when money lands
25%

Where the overcharge hides

Vendors tax on the billing address and tax defensively. Accounts payable pays whatever the invoice says.

  • The whole bill taxed at head office

    A $1M licence, 40% of users in New York, all of it taxed at New York rates.

    Back to you Tax on the other 60%, less use tax where they sit

  • Tax on services

    Implementation, training and consulting billed on a software invoice.

    Back to you The tax on those lines

  • Tax where software isn’t taxed

    SaaS or cloud compute billed to an office in a state that doesn’t tax it.

    Back to you All of it

  • The wrong state or rate

    An old bill-to address; Texas on 100% instead of 80%; Connecticut at 6.35% instead of 1%.

    Back to you The difference

Most states let you claim three to four years back. Every finding carries its invoice, line, rule, amount and a confidence level.

California starts taxing SaaS on January 1, 2027

SB 122 ends a thirty-year exemption. Every vendor starts charging California tax at once, on billing address, while custom software, human services, infrastructure and use outside California stay exempt. The overcharges start in January.

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Who it’s for

Works with the exports you already have

Read-only, under NDA. Nothing to install and nothing that touches money.

  • Brex exports
  • Ramp exports
  • Amex statements
  • AP exports
  • Vendor invoices
  • Headcount by state

Frequently asked questions

What finance teams ask before sending their first export.

What does Avoir do?

It reads your software and AI invoices, finds the sales tax your vendors charged that you didn’t owe over the last three to four years, and gets it back. Refunds go straight to you.

Do you need access to our bank or accounts?

No. Read-only exports under NDA: card or AP spend, your top vendors’ invoices, and headcount by state. No bank logins, no access to money.

What does it cost?

The scan is free. Recovery is 25% of what actually comes back, invoiced after it lands. Founding design partners recover at 15%. See pricing.

Who decides what gets claimed?

You do. You approve every claim before it goes out. Lines we’re unsure of go to a person and to our tax partner, who signs off on every position.

How far back can we claim?

Most states allow three to four years, and every claim has a deadline. We track each one from day one.

What changes in California in 2027?

SB 122 ends a thirty-year exemption and California starts taxing SaaS on January 1, 2027. Vendors will charge it on billing address, while custom software, human services, infrastructure and use outside California stay exempt. That gap is where the new overcharges come from.