# Tax Rate Verification Checklist

> Find every tax line in a tax summary or payroll report, make sure that the math is correct, and compare each rate with the official rate.

## What this checklist is for

Tax summaries, payroll tax reports and invoices often list several taxes on one page. These taxes can be federal, state, local, payroll, sales tax or VAT. Two types of error are frequent.

The rate can be wrong, for example an old rate or the rate of a different jurisdiction. A jurisdiction is the government area that charges the tax. The math can also be wrong, for example when the base times the rate does not equal the tax amount. The base is the amount that the tax applies to.

This checklist finds every tax line and makes sure that the math is correct. It also compares each rate with the rate that the tax authority publishes. The checklist is a review aid, not tax advice. Use the tax authority as the source for each rate. If the result affects a filing or a payment, ask a tax professional.

## The checklist

| # | Item | What to look for | Common mistakes |
|---|---|---|---|
| 1 | Tax lines | Type, jurisdiction, period, base, rate and amount of each line. Include lines in footnotes and subtotals. | You miss a tax that appears only inside a total |
| 2 | Type and jurisdiction | Federal, state, county, city or country. Payroll, income, sales, use or VAT. | A city or district tax is inside the state rate, without a separate line |
| 3 | Period | The rate in force for the dates of the document | You use the rate of this year for a period of last year |
| 4 | Base | The amount that the tax applies to: gross wages, wages up to a limit, taxable sales, or an amount without exempt items | You apply the rate to the full amount, but the tax has a wage base limit or exempt items |
| 5 | Calculation | Base times rate, compared with the amount on the document | You report a one-cent rounding difference as an error. Or you miss a real difference that the rounding hides. |
| 6 | Rate format | Percent or decimal (6.2% or 0.062). Single rate or combined rate. | A combined rate appears where you expect a single rate |
| 7 | Official rate | The rate that the tax authority publishes for that type, place and period | The rate comes from memory, a blog or an old spreadsheet |
| 8 | Totals | The tax lines add up to the total tax. Where it applies, net plus tax equals gross. | A line is in the total two times, or not at all |
| 9 | Open items | Missing base, missing period, no rate on the document, or a scan that you cannot read | You mark a line "OK", but nobody compared its rate with the official rate |

## Where to find the official rate

Always use the page of the tax authority for the period of the document. Some examples follow:

- For US payroll taxes, the IRS ([Topic 751](https://www.irs.gov/taxtopics/tc751)) lists Social Security at 6.2% for the employee and 6.2% for the employer. Medicare is 1.45% for each. Social Security applies only up to a wage base limit, which is the maximum wage that the tax applies to. For earnings in 2026, the limit is $184,500. Medicare has no wage base limit. Employers withhold an Additional Medicare Tax of 0.9% on wages above $200,000 in a calendar year.
- For the US federal unemployment tax (FUTA), the IRS ([Topic 759](https://www.irs.gov/taxtopics/tc759)) gives a rate of 6.0%. The tax applies to the first $7,000 that you pay to each employee in the year. A credit of up to 5.4% for state unemployment tax can lower the rate to 0.6%.
- For US sales tax, the states set the rates, and local taxes can add to them. The rate depends on the address. In California, for example, the [CDTFA](https://www.cdtfa.ca.gov/taxes-and-fees/sales-use-tax-rates.htm) lists a statewide base rate of 7.25%. It says that most areas add district taxes between 0.10% and 2.00%. The CDTFA site also has a rate lookup by address.
- For EU VAT, the [VAT rates page](https://taxation-customs.ec.europa.eu/taxation/vat/vat-directive/vat-rates_en) of the European Commission says that each member state sets its own rates. The standard rate must be at least 15%. The page links to the Taxes in Europe Database (TEDB), which shows the rates of each country.

These rates change. Look at the source again for each period that you review.

## How to record the result

Use one row for each tax line:

| Line | Tax type | Jurisdiction | Period | Base | Rate in document | Official rate | Rate source (link and date) | Recalculated amount | Amount in document | Difference | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| | | | | | | | | | | | |

Use four status values: OK, rate mismatch, math mismatch and not compared. Under the table, list each mismatch with a short note about the possible cause.

## Use this checklist with Claude or ChatGPT

You can give Claude or ChatGPT the checklist and the document. Ask the AI tool to fill in the table. Give it the official rates from the sources above. Do not let it use rates from its memory.

```text
You are helping me check the tax lines in a document. This is a review aid, not tax advice.

Checklist:
1. List every tax line: tax type, jurisdiction, period, base, rate and amount. Include lines in footnotes and subtotals.
2. For each line, recalculate base times rate and compare with the amount shown. Show the calculation.
3. Check that the tax lines add up to the total tax.
4. Compare each rate with the official rates I give below. Do not use rates from memory. If I did not give a rate for a line, write "to confirm" and name the tax authority I should check.
5. Note any base that looks wrong (for example, a tax with a wage base limit applied to all wages).

Output:
- A table with the columns: line, tax type, jurisdiction, period, base, rate in document, official rate, recalculated amount, amount in document, difference, status (OK, rate mismatch, math mismatch, not compared).
- For each checklist item, one or two lines on how you checked it.
- A list of everything you could not determine, and why.

Official rates for this period (from the tax authority):
[paste the rates and their source links]

Document (personal and account numbers removed):
[paste the text or attach the file]
```

Before you use the result:

- Do the calculations again in a spreadsheet. Compare every rate with the rate of the tax authority for the correct period. AI tools can make arithmetic errors, and they can give old rates with confidence.
- Remove or redact taxpayer ID numbers, Social Security numbers, bank details and names before you paste or upload. Tax documents often contain them. Also read your workspace's data settings.
- If a mismatch affects a filing or a payment, ask a tax professional before you act.

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