[octex]

How can you know what your Federal income tax will be for 2018, when it’s only October?

Serious question.

[abb]

I quit using turbotax last year. Every year it was $5 or $10 more, even with a discount.

I use this now. Has all the forms with it.

https://sites.google.com/site/excel1040/home/2018-tax-planner-new-tax-law

2018 Federal Income Tax Spreadsheet (Draft)

[CatOwner]

How can you know what your Federal income tax will be for 2018, when it’s only October?

When you're on fixed income as retirees, and you have a pretty good idea of what your non-SS/non-pension income will be, you can get pretty close. Exceptions would be unexpected medical expenses (and a possible increase in deductions). Other than that, we are fairly close to what I estimated earlier this year.