nox7_api

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[gloomy plover]

Hi there. Why do you think the tax calculation is incorrect on an amount of $5?

[tough ingot]

Because it's not me doing the taxes rounding. The only thing in my request is my application asking for a credit note preview from the API. The API only requires I provide the amount + line item Id.

Stripe does the tax calculation. And Stripe is erroring on itself. I can't remember if this has already been reported; but either way it's hindering my integration with Stripe.

Simply, I'm asking Stripe "Give me a credit preview for a line item with $5.00" and then it errors saying the tax calculation is wrong - but Stripe is internally calculating the taxes not me. I can't control its rounding error.

[gloomy plover]

Yeah but to be clear why do you think the calculation we're doing is wrong? Aren't you just passing in too high of an amount?

[tough ingot]

I'm passing in the remaining line item amount (500/$5.00)

I don't understand how it can be too high. It's the remaining line item amount on the invoice.

I'm willing to try something else just to make this work, but it even errors in Stripe's website dashboard too. Something seems fatally wrong with issueing a credit note, then a second one on the remaining amount (a total of two credit notes, one after another) in Stripe's infrastructure

[trim timber]

Hello
Jumping in here as my colleague needs to step away

Give me a moment to take a look

[tough ingot]

Thanks

[trim timber]

I think this might be due to the manual tax rate, still looking

Okay I looked and it seems like this is due to Line item level rounding - https://docs.stripe.com/tax/tax-rates#rounding

Per-line tax rounding generates a credit note total ($5.38) that exceeds the remaining invoice balance ($5.37) by 1 cent.

The invoice in_1TX00LRhusOkdeelRxCMVqFk totals $86.00 ($80.00 + $6.00 tax at 7.5%). A prior pre-payment credit note cn_1TX00zRhusOkdeelLd1BEjHZ for $80.63 ($75.00 + $5.63 tax) left $5.37 remaining.

The preview for $5.00 subtotal computes tax as $5.00 × 7.5% = $0.375, rounded up to $0.38, totaling $5.38 — but the sum of individually rounded taxes ($5.63 + $0.38 = $6.01) exceeds the invoice-level tax ($6.00), making it impossible to credit the exact remaining balance at the line-item level.

[tough ingot]

I see, so that is the source of the issue; but in this circumstance what should I do instead if a user gets to this point? Swap to amount-based refunds/credits if an existing credit note already exists?

[trim timber]

Yeah if you do amount based credit notes (without il_) then that bypasses per-line tax calculation

You can also reduce the line item amount by 1 cent

which isn't ideal

[tough ingot]

Right, seems a little hacky; but I get the idea. No way around this really without one or the other.

Alright, thanks. I'll take one of those approaches and move on.