Do I have to have last year’s taxes for this year

[DoninGA]

If you filed a 2024 tax return you will need the 2024 AGI on Form 1040 Line 11, to e-file the 2025 tax return.

[VolvoGirl]

You will need the 2024 AGI to efile this year.  Or you may need to transfer from 2024 to carry over any  employers or banks, etc. and any amounts .

You need your 2024 AGI to efile 2025. The AGI is on 2024 1040 or 1040SR line 11. If you filed a Joint return you use the same AGI for each spouse.

How to find the AGI.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

Or request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript