IRS Direct File

IRS Direct File ended after tax year 2024 with the cuts in government activity by the present regime. The previous situation is described below:

IRS Direct File enables certain tax payers to do their income taxes themselves online. Details are at their website https://directfile.irs.gov/

You will need to get an ID.me account, which they will direct you to.

It works for many states (not all) including Washington. Here is a short list of the things they can and can't do, as of the 2025 filing season (i.e. for 2024 taxes).
Their website goes through all this nicely and in some more detail. In future years they may do more things, so check.