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Tools/calculators for monthly retirement cash flow and tax estimation

We have reached a point now we don’t need to use either free or paid tools or calculators for things like, figure when to claim social security, we have converted all our t-IRA accounts, so no RMD, nor NIIT, nor IRMAA. We have also done our estate planning and a letter of instruction, etc. We did very well with our budgeting with our spreadsheets.  All that is left to figure out annually are our annual retirement cash flow/income, and an estimation for coming year tax liabilities.  Our question is what do you use to estimate both? Thanks in advance for any input and insights.

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DAN SMITH
6 months ago

Achnk53, don’t say ‘spreadsheet’, you’ll only encourage RDQ 😁. Seriously, your past planning has landed you in a great place.
You didn’t say what your other income consisted of. People with only non-taxable IRA distributions and Social Security income would not have any tax concerns. 

Cash flow? I am aware of our fixed income and IRA distributions, and what we spend. The former is significantly more the latter. Life is good. 

Regarding withholding, I don’t care for tax calculators, my way is much faster. I want to avoid a penalty, so as long as I’m within 90% of liability, I’m happy. If I know I will have significantly more income going forward, I’ll open last year’s tax return and pop in the approximate increase (as interest), then compare the tax to my current withholding. I will schedule estimates if needed. (I could just multiply the increased income by my marginal tax rate of 12%, but this wouldn’t tell me the effect on the taxable portion of my Social Security) 
Additional calculations would violate my KISS philosophy.

DAN SMITH
6 months ago
Reply to  achnk53

Got it. I think you’ve done a great job minimizing your tax exposure.

mytimetotravel
6 months ago
Reply to  DAN SMITH

Isn’t it even simpler to pay 100% (or 110%) of the previous year’s tax? I take my RMD near the end of the year, and make sure the additional withholding will get me there.