I gave a donation using a check mailed in 2017, but the organization acknowledged they received donation in 2018. Should donation be reported on my 2017 or 2018 taxes?

[mubasharm]

I wrote the donation check in 2017 but the organization cashed it in 2018; which year do I claim the deduction?

[LisaBr · Accepted solution]

If the postmark on your donation was 12/31/2017 or before, then you can include this amount on your 2017 tax return.

If not, you will need to use it in 2018.