Check till tax totals before posting each sale by confirming the rate, price treatment, exemption and final amount.
Key takeaways
- Confirm the tax rate against the figure for your location.
- Check whether each price already includes tax.
- Confirm any exemption before applying it.
- Compare the calculated total with the screen before posting.
Once a sale is posted with the wrong tax on it, that error becomes part of the day's totals, and someone has to find it later. This post covers four checks that shop staff can run at the till on each sale, and that the owner or manager can look for when reviewing the till tax totals at close.
The owner and the staff who ring up sales need the same four checks, read from opposite ends. Staff use them at the counter, one sale at a time. The owner or manager uses them at close, looking at the day's sales as a whole, so the two halves can be lined up when the totals are reviewed.
Some of the figures in this post come from Stripe's documentation for its billing product. Stripe's rules belong to Stripe, so treat those figures as examples of how a tax calculation is laid out, not as rules your till must follow. Where a figure comes from a page, the post names the product it describes.
1. Enter the tax rate exactly as given
Enter the tax rate exactly as your tax authority gives it, including every decimal place. In Stripe's tax rate setup, the percentage is a number of up to 4 decimal places that represents the tax percentage to be collected ( Stripe Documentation, "Tax rates | Stripe Documentation"). That limit belongs to Stripe's product, so the number of decimal places your till accepts may be different. Do not round it in your head or on paper.
The rate is the first number every tax calculation depends on. A wrong rate does not show up as one bad sale. It carries into every sale that uses that rate until someone notices, and it is harder to trace once the close begins. That is why this check comes first, before any item is rung up.
Staff should read the rate on the screen rather than work from memory. If the rate shown does not match the rate the manager has given you, do not ring up anything that uses that rate. Tell the manager, and let the manager make the correction in the till settings. A rate changed in the middle of a shift makes the close harder to trace, because some sales would carry the old figure and others the new one, and the two groups are easy to confuse once the day is over.
If the till uses more than one tax rate, match each item to its rate before the total appears. Look at the item, then at the rate the till has assigned to it, and only then press the key that adds the item to the sale. Staff should not change the rate assigned to an item on their own, even when the item looks wrong to them.
The owner or manager can confirm this check at close by comparing the rate settings with the rate the tax authority publishes for the location. Doing it before the totals are signed off gives the owner a fixed rate to compare the day's sales against. For setup checks, see setting a shop register's sales tax rate.
A short routine at the start of each shift helps. The staff member reads the rate for each tax type the till uses, and the manager confirms that each one matches the owner's list. The rate check on each sale then rests on a number that has already been confirmed for the shift, rather than one that was typed in during a busy stretch at the counter.
2. Confirm whether each price includes tax or leaves tax to be added
Know whether each price includes tax or leaves tax to be added on top. Stripe's documentation illustrates a 25% tax rate modifying the total amount due, depending on whether the tax is exclusive or inclusive. The rate is the same in both cases, and the total is still different, so the rate check in step 1 does not cover this one.
For a till, the question is the same: does the price on the screen already include tax, or will tax be added to it? The two cases produce different totals. If an item is treated as the wrong kind of price, the customer pays a different total from the one the price implies, even when the rate itself is correct.
Before ringing up an item, look at how its price is set up. If the setup does not make it clear whether the price includes tax, ask the manager rather than guessing. A guessed price type can produce a total that looks reasonable on the screen but does not match what the sale should have produced.
The owner's price list is the reference for these answers. For each item, it should say whether the price includes tax. When a staff member is unsure, the list answers the question without a conversation at the counter, and when the owner changes an item's treatment, the list is where that change should appear for staff to follow.
Once the treatment of an item is known, keep it consistent for every sale of that item. A price entered one way on one day and another way on the next can produce totals that each look correct on their own day, and those totals may not agree at close. That difference is visible when the day's totals are put side by side, which is why the owner or manager should look for it then.
At close, the owner or manager can pick several sales of the same item from different times of day and confirm that each one was treated the same way. The review does not need every sale on the day. A sample from each item can show whether the setup is being followed, and a sample that shows a difference is a reason to look at the setup itself rather than the individual sales.
3. Confirm whether the sale is exempt before tax is applied
Confirm whether the customer or the sale is exempt before tax is applied, and do not apply an exemption that the owner has not approved. Stripe's documentation includes a separate illustration for an exempt or reverse customer: a 10% tax rate modifying the total amount due for that customer. The exemption question therefore needs an answer before the total is posted.
An exemption changes the tax on the sale itself. A sale that should have been taxed and was not, or one that was taxed and should not have been, will be wrong in the totals even when the other three checks were done carefully. Staff should not decide an exemption from memory or from what the customer says alone. The owner's procedure should say what the staff member needs before the exemption is applied, and the staff member should follow that procedure every time.
Whether a customer or sale qualifies for an exemption is a legal question that depends on the rules that apply where you trade. Confirm each case with the tax authority for your location or a tax professional before staff apply it at the till.
If the till has a field for recording an exemption on a sale, use it for every exempt sale and leave it blank for every other sale. A sale that carries an exemption mark should be one that the owner has already approved, and the close review depends on that mark being accurate.
At close, the owner or manager looks at each exempt sale and asks three questions: whether the exemption was approved, whether the approval matches the sale, and whether the exemption mark on the sale matches the approval. A sale that fails any of the three goes to the manager before the totals are signed off.
4. Compare the calculated total with the screen
Confirm that the total on the screen matches the calculation before the sale is posted. In Stripe's documentation, the total amount due is calculated by summing the post-discounted amount and the exclusive tax amount. This is the last check, and it ties the other three together: the rate sets the tax, and the exclusive or inclusive treatment sets how the tax is added.
Worked example: checking an inclusive sale
A staff member runs a sale with a tax-inclusive price of 50 and no discount. They check the rate on the screen against the rate the manager gave them, confirm tax is already included in the price, and confirm no exemption applies. The amount due remains 50, and that is the figure they compare against the screen. If the screen adds tax on top, the sale stays unposted while the manager checks the price treatment.
For an inclusive price, tax is already inside the price, so step 4 does not add tax on top; the total is the post-discounted amount. Stripe's documentation shows that the total changes with that choice, so the staff member should not skip step 2 for any sale, even one that looks ordinary.
If a customer asks how a total was reached, the answer comes from the same four parts: the rate, the price treatment, any exemption, and the final amount. Giving that answer from the screen keeps the explanation tied to the recorded figures of the sale.
The final comparison is the one that catches errors the earlier steps missed. A rate that was entered correctly, an item with the right price type, and an exemption that was approved can still produce a total that does not match the screen, because of a keying error or a discount that was applied in the wrong order. Comparing the screen with the calculation before posting catches those before they reach the close.
When the total on the screen does not match the sum, the staff member should not adjust the total to fit what the customer expects. The sale stays unposted, and the manager looks at the rate, the price treatment, and the exemption mark, in that order. Overriding a total at the counter moves the difference out of sight, which is the outcome these four checks are meant to prevent.
At close, the owner or manager reviews the till tax totals against the rate settings, the price setup for each item, and the exemption marks from step 3. The review is easiest when each sale carries the rate and exemption it was posted with, because then each total can be traced back to the checks that produced it. Pair that review with recording cash totals before close.
Keep the close report, the exemption records, and the rate settings together with the day's sales. The review depends on those records being in one place, and a close without them cannot show that the four checks were made.
Today, choose an unposted sale and walk through these checks with the manager before posting it.
Related guides: Check items before charging sales tax in your shop · Local sales tax changes before register updates.
Questions about till tax totals
Does a correct rate guarantee a correct total?
No: price treatment, exemptions and discounts also affect the calculation.
What should staff do when a total looks wrong?
Keep the sale unposted and ask the manager to check it.
What records help with the close review?
Keep the day's sales, close report, exemption records and rate settings together.