Retire at 66 instead of 65
Work one additional year
+$146,266
at retirement
Estimate how much you may need to save for the lifestyle you want in retirement.
Years until retirement
30
years
What do you spend per month today? This should be your after-tax, take-home spending.
Estimate how your monthly spending will change in retirement, in today's dollars.
Mortgage paid off, downsizing, or rent changes.
More travel, hobbies, family visits, or experiences.
Medical, dental, long-term care, or insurance changes.
Gifts, taxes, family support, or any other changes.
$4,300 /month
Today's dollar estimate
$51,600/year
Your retirement lifestyle cost before inflation.
Estimated retirement tax assumption
8.2%
Based on 2026 federal single-filer brackets, with the standard deduction applied.
Estimated future spending needed
$9,287/month
Assumes 2.6% annual inflation through age 65.
Simplified pre-tax withdrawal model. State tax, Social Security, Roth withdrawals, and itemized deductions are not included.
Your additional savings are assumed to grow at 7.0% annually until retirement.
Not sure if your plan allows it? The Mega Backdoor Roth Calculator can help you check.
Small changes can make a big difference.
Work one additional year
+$146,266
at retirement
From 8% to 9% of salary
+$188,922
at retirement
$500 less per month in retirement
+$323,975
at retirement
Use Mega Backdoor Roth
Save extra after-tax money in your 401(k)
+$483,576
at retirement
Go to Mega Backdoor Roth CalculatorBit Crossing provides practical estimates to help you understand your options and decide whether the next step may be worth taking. Results are based on the assumptions you provide and simplified financial models. They are not tax, legal, investment, or financial advice. For decisions with significant financial impact or complex situations, consult a qualified CPA, financial advisor, plan administrator, or other appropriate professional.