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Reference material for the numbers Promi computes, written to be read by someone who has not done this before.

Retirement Accounts

The tax-advantaged account types, what each one does, and where the rules differ. Contribution figures are 2025 and the IRS indexes them annually.

401(k)
An employer-sponsored retirement account with tax advantages and, often, matching contributions.
401(k) Match
Employer contributions made in proportion to your own, up to a stated ceiling.
IRA (Individual Retirement Account)
A retirement account you open independently of any employer, in traditional or Roth form.
Roth IRA
An after-tax retirement account where qualified withdrawals, growth included, are untaxed.
Backdoor Roth IRA
A non-deductible traditional IRA contribution converted to Roth, which the income limits do not restrict.
Roth Conversion
Moving a balance from a traditional account to a Roth, paying income tax in the year of the move.
HSA (Health Savings Account)
The only US account that is untaxed on contribution, on growth, and on qualified withdrawal.
403(b) & 457 Plans
Workplace retirement plans for nonprofit and government employees, with different early-withdrawal rules.
529 Plan
A state-sponsored account where growth used for qualified education expenses is untaxed.
RMD (Required Minimum Distribution)
The minimum amount that must be withdrawn each year from tax-deferred accounts, starting at 73.
Tax-Advantaged Accounts
Accounts carrying a deduction, deferral, or exemption, and how they differ from a taxable brokerage.

Worked examples for every term

This content is educational and informational only. It is not financial, investment, or tax advice. Consult a qualified professional before making financial decisions.

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