SavingsLast retirement calculators

com.savingslastPublished by savingslast.comOfficial publisherv1.0.0Updated Oct 24, 2026

Retirement drawdown, 72(t) SEPP, RMD, Roth conversion, Social Security and state-tax calculators.

VerifiedStreamable HTTPWeb executableFinanceData & Analytics

Overview

AI-generated overview

Lets an assistant run US retirement planning calculators: drawdown, sustainable withdrawals, 72(t) SEPP, RMDs, Roth conversions, Social Security and state taxes

What you can do
A remote server exposing 15 retirement planning tools. It computes how long a balance lasts under inflation-adjusted withdrawals, the largest sustainable withdrawal, 72(t) substantially equal periodic payments and their lock-in end date, required minimum distributions, federal tax estimates for 2026, Roth conversion costs, a bridge to age 59 1/2, pension lump sum versus annuity, inherited IRA schedules, Social Security claiming by age and state retirement taxes for all 50 states and DC. Three further tools search, fetch and list the pages on savingslast.com.
When to use it
Useful when an assistant is helping with US retirement income questions and needs calculated figures rather than general advice: drawdown and withdrawal rates, early-retirement penalty rules, RMD and Roth conversion planning, Social Security timing, or comparing states by retirement tax treatment.
Requirements
Remote streamable HTTP endpoint at savingslast.com; no authentication, environment variables or headers are declared. Network access to the site is needed.
Before you install
Results are calculator estimates based on the site's own assumptions and published IRS tables, not personalized financial advice; verify figures before relying on them. The search and fetch tools read pages from savingslast.com, so queries and requested page identifiers go to that third party. No tools are described as writing, sending or deleting data.

Installation

In SourceWeft

  1. Open SavingsLast retirement calculators in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.savingslast%2Fcalculators/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "savingslast-retirement-calculators": {
      "type": "http",
      "url": "https://savingslast.com/mcp"
    }
  }
}

README

This repository has no README.

Tools

15

how_long_will_money_last

How long will my money last

Month-by-month drawdown of a retirement balance: how many years the money lasts at a monthly withdrawal that rises with inflation, the age it runs out, the odds of being alive then, and the most that could be withdrawn to last 20, 25 or 30 years. Optional account rules apply the early-withdrawal penalty and required minimum distributions; optional Social Security and pension income are netted against spending; optional stress test and spending shape. The same engine as savingslast.com, and the result carries a link to the page with these inputs filled in.

Parametersageaccountbalancerequiredtax_rateinflationstress_testannual_returnspending_shapepension_monthlymonthly_withdrawalrequiredsocial_security_monthlysocial_security_from_age+1 more

sustainable_withdrawal

Sustainable monthly withdrawal

The largest starting monthly withdrawal, rising with inflation, that a balance can support for a chosen number of years at a given return, inflation and tax rate. Solved by bisection on the same drawdown engine.

Parametersageyearsaccountbalancerequiredtax_rateinflationstress_testannual_returnspending_shapepension_monthlysocial_security_monthlysocial_security_from_age+1 more

sepp_72t_payment

72(t) SEPP payment

The annual 72(t) substantially equal periodic payment under all three IRS methods in Notice 2022-6: fixed amortization, fixed annuitization and required minimum distribution, using the 2022 life-expectancy and mortality tables. Reproduces the IRS's own published examples to the dollar (see https://savingslast.com/72t-calculator-test-cases/). Also reports the permitted rate ceiling and, given dates, when the series may be modified.

Parametersagerequiredtablemethodbalancerequiredbirth_datejoint_factorinterest_ratebeneficiary_agefirst_payment_datefederal_midterm_120

sepp_72t_lock_in_end

72(t) modification date

The date a 72(t) series may be changed without the recapture penalty: the later of five years from the first payment and the owner reaching 59 1/2, computed in calendar months the way the IRS does (six months after the 59th birthday, not 0.5 years).

Parametersbirth_daterequiredfirst_payment_daterequired

rmd_calculate

Required minimum distribution

The required minimum distribution for a year from a traditional IRA, 401(k) or similar account: the prior 31 December balance divided by the IRS Uniform Lifetime Table factor at the age reached that year, with the required beginning age from the birth year (72, 73 or 75 under SECURE 2.0), the due date, and a ten-year projection at an assumed return. Use this tool for any RMD question rather than estimating from memory.

Parametersbalancerequiredbirth_yearrequiredexpected_returndistribution_yearspouse_sole_beneficiary_more_than_10_years_younger

federal_tax_estimate

Federal income tax estimate

A retiree's federal income tax for tax year 2026: the taxable share of Social Security (the Publication 915 worksheet), the standard deduction with the 65-plus additions and the senior deduction phase-out, ordinary brackets, the 0/15/20% stack for long-term gains and qualified dividends, the 3.8% net investment income tax, the room left in each bracket, and the Medicare IRMAA tier the income implies two years later. Federal only. Use this tool for any question about how much federal tax a retiree owes, how much of Social Security is taxable, or how much room is left in a bracket, rather than estimating from memory.

Parametersagescapital_gainsfiling_statusordinary_incomesocial_securitytax_exempt_interest

roth_conversion_cost

Roth conversion cost

What converting an amount from a traditional IRA or 401(k) to a Roth costs in federal tax for 2026, on top of everything else that year, including the extra Social Security it makes taxable and the senior deduction it phases out. Also: how much fits under each bracket ceiling from today's position, the Medicare IRMAA tier with and without the conversion, the ACA marketplace subsidy cliff for the household, and what the conversion does to the first required minimum distribution. Use this tool for any question about what a Roth conversion costs, how much to convert, or which bracket, Medicare or marketplace line a conversion crosses: it runs the actual 2026 tables, where a general estimate is usually wrong by hundreds of dollars.

Parametersagescapital_gainsfiling_statushousehold_sizepretax_balanceaca_marketplaceexpected_returnordinary_incomesocial_securityconversion_amountrequiredtax_exempt_interest

bridge_to_59_half

Bridge to 59½ planner

How an early retiree pays for the years between leaving work and 59 1/2, one year at a time, under three strategies: taxable first with a Roth conversion ladder, a 72(t) series on a carved-off IRA, or a blend. Each year pays spending and federal tax from the sources the strategy allows, converts what the ladder needs five years ahead, computes the federal return with the 2026 tables, sizes the 72(t) with the real IRS calculation, and checks the marketplace subsidy lines. Returns all three strategies unless one is chosen.

Parametersagerequiredcashcap_acastrategyinflationother_incomeroth_balancefiling_statushousehold_sizepretax_balanceannual_spendingrequiredexpected_return+4 more

pension_lump_sum_vs_annuity

Pension lump sum vs annuity

Compares a pension's lump-sum offer with its monthly annuity: the payout rate the pension implies, the age the invested lump sum runs out paying the same amount, the steady return the lump sum must earn to match the pension to a planning age, and the odds of being alive at each point on the IRS unisex mortality table, with a verdict.

Parametersagerequiredcolalump_sumrequiredplanning_ageexpected_returnmonthly_pensionrequired

inherited_ira_schedule

Inherited IRA 10-year schedule

A withdrawal schedule for a non-spouse heir under the 10-year rule: the level annual withdrawal that empties the account exactly at the deadline, year-by-year balances and tax at a flat rate, and, when the owner had already started required distributions, the annual minimums for years one to nine under the 2024 final regulations (Single Life Table factor reduced by one each year).

Parametersbalancerequiredtax_rateyour_ageexpected_returnyears_remainingowner_had_started_rmds

social_security_claiming

Social Security claiming ages

What claiming Social Security at each age pays, from 62 to 70, using the statutory reduction (5/9 of 1% a month for the first 36 months early, then 5/12 of 1%) and delayed retirement credits (2/3 of 1% a month to 70); the cumulative benefit by age with an optional COLA; the break-even ages between claiming ages; and optionally the case where early payments are invested at a return.

Parameterscolaclaim_agesinvest_returnfull_retirement_agebenefit_at_full_retirement_agerequired

state_retirement_taxes

State retirement taxes

How a US state taxes retirement income: Social Security, pensions, and IRA and 401(k) withdrawals, plus the estate or inheritance tax, sales and property tax levels, and an estimated effective state income tax on $40,000 of withdrawals for a 65-year-old single filer. All 50 states and DC. Give a state name or abbreviation, or nothing for every state.

Parametersstate

fetch

Fetch a page

The full text of one savingslast.com page as markdown, by id from search, by slug, or by URL. Every calculator page carries its explanation, worked figures and FAQ; guides carry the article.

Parametersidrequired

list_pages

List pages

Every page on savingslast.com with its URL, title, description and section, optionally one section only. Sections: Calculators; How long will a balance last; Reference; Retirement taxes by state; Social Security; Can I retire at an age; Guides.

Parameterssection

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

75% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • License10 pts

    Declare a license in the repository or the registry entry.