QuantCalc Retirement Engine

Name: QuantCalc Retirement Engine
Author: quantcalc-app

by quantcalc-appversion 1.8.0i★ –iRuns in the cloud

Registry nameapp.quantcalc/retirement-engine

Install

Overview

Description from the maker (original English)

Retirement Monte Carlo, tax-aware withdrawals, 2026 tax calculators, RMD, IRMAA, every-state tax.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Accounting, finance & tax

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://mcp.quantcalc.app

Run this in your terminal

claude mcp add --transport http retirement-engine https://mcp.quantcalc.app

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "retirement-engine": {
      "url": "https://mcp.quantcalc.app"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "retirement-engine": {
      "type": "http",
      "url": "https://mcp.quantcalc.app"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://mcp.quantcalc.app

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain quantcalc.app (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Accounting, finance & taxi

More stars than 0% of the other 1720 servers in this category
Published to the registry more recently than 89% of the other 1720 servers in this category
Basic checks equal to or better than 100% of the other 1720 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is QuantCalc Retirement Engine safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.8.0) reached the registry 4 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Finance Toolkit, SolidInvoice, Korea Tax Calculator

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Finance Toolkit

by JerBouma

500+ transparent financial methods calculated from raw statements, not third-party endpoints.

Computer or cloud★ 5,496MITUpdated yesterday

Install

SolidInvoice

by SolidInvoice

Create and send invoices and quotes, manage clients, and track payments in SolidInvoice.

Runs in the cloud★ 981MITUpdated 7 days ago

Install

Korea Tax Calculator

by UpstageAI

Korean tax calculation and tax-audit judgment MCP: 96 tools with statutory citations.

Runs on your computer★ 97MITUpdated today

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

QuantCalc Retirement Engine — Claude plugin

Gives Claude the retirement engine and the federal and state tax engines behind quantcalc.app, so a projection or a 2026 tax figure is computed rather than estimated.

A language model cannot run thousands of correlated return paths against a spending plan and get the odds right. It can ask something that can.

[Privacy policy](https://quantcalc.app/privacy.html) · [Terms](https://quantcalc.app/terms.html) · Support: [hello@quantcalc.app](mailto:hello@quantcalc.app) · [Documentation](https://quantcalc.app/advisors/mcp/)

Install

Install from the Claude plugin directory. The plugin installs switched off, and you enable it when you want it. Step-by-step instructions are in SETUP.md. To use the server without the plugin, add it as a custom connector:

https://mcp.quantcalc.app

What's in the plugin

Connector: the hosted QuantCalc engine over streamable HTTP. No account or sign-in is needed.
Skill `retirement-projections`: loads when a plan, withdrawal rate or success rate comes up. It keeps the assumptions attached to every number and flags differences that fall inside the margin of error.
Skill `tax-calculations`: loads when a 2026 tax question comes up — a return, a paycheck, an RMD, a Roth conversion, IRMAA, capital gains, estimated payments or the ACA credit. It maps each question to the tool that computes it and keeps the defaults and the not-modelled items with the figure.
Skill `setup`: connection steps, what a licence key changes, and troubleshooting.

Tools

Twenty-two tools. "Free" means the tool computes without a licence key; "Licence" means it needs a connected QuantCalc PRO licence or Tax Season Pass (PRO only where stated), and without one it computes nothing and names the free web page that does.

Retirement projections

Tool	Key	Returns
`run_retirement_projection`	Free	Success rate, ending-portfolio distribution, and the assumptions that produced them
`run_tax_aware_projection`	Free	The recommended withdrawal order and Roth-conversion programme, its present-value advantage and range against traditional-first, and the after-tax success rate, with federal and state tax, RMDs, IRMAA and Social Security taxation paid from the portfolio. With `move_state` (`state`, `year`, `month`) it plans a move to another state: the old state's tax before the move year, a part-year return in each state in the move year, the new state's after it, and the lifetime state tax compared with staying and with moving now
`compare_return_assumptions`	Free	The same plan under each published capital market assumption set
`list_return_assumption_sources`	Free	Which assumption sets the engine carries, and what each publisher provides
`explain_methodology`	Free	What the engine models and what it deliberately leaves out
`optimize_social_security_claiming`	PRO	The tax-aware plan run at every Social Security claiming age from 62 to 70 on the same simulated markets: each age's success rate and median paired difference against the plan, and the best age with its 10th–90th percentile range

2026 tax returns and calculators

Tool	Key	Returns
`estimate_2026_tax_return`	Licence	A 2026 federal and state return estimate: the refund or amount owed, the main Form 1040 lines, the state tax, every default assumed and what is not modelled. Takes self-employment (Schedule C) profit for the filer and the spouse in `self_employment_income` and `spouse_self_employment_income`: Schedule SE, the half-SE-tax deduction and the qualified business income deduction are figured
`state_tax_in_every_state`	Licence	One household's 2026 state income tax in all 50 states and DC, ranked from lowest to highest, with each state's difference from the state it lives in now, the federal tax (the same in every state), the county taxes included, every default assumed and what is not modelled. Military retirement pay goes in `military_pension` (not `pension`): a taxable pension on the federal return, and in each state that state's own military retirement rule (exempt, capped, age-tested or credited); on a joint return it follows `spouse_split` like the pension
`calculate_2026_income_tax`	Licence	2026 federal income tax and, given a state, state income tax from wages (with the overtime and tips deductions), dependents and other common income; the Social Security and Medicare tax on the wages, the effective and marginal rates, take-home pay, and, given withholding, the refund or amount owed
`pretax_contribution_savings`	Licence	What a health FSA or HSA contribution saves in federal income tax, Social Security and Medicare tax and state tax, for 2026 or projected 2027; payroll or direct HSA contributions; the after-tax cost and an optional FSA forfeiture estimate
`business_deduction_tax_savings`	Licence	What a self-employed business deduction (2026 business miles at the half-year rates, or a dollar expense) saves in income tax, self-employment tax, earned income credit and state tax
`retirement_plan_deferral_savings`	Free limit; licence for the tax	For a 401(k), 403(b), 457(b), TSP or SIMPLE IRA in 2026 or projected 2027: the contribution limit at the saver's age with the age-50 and age-60–63 catch-ups, and the part that must go in as Roth — free; the federal income tax saved (and the 2026 Saver's Credit), $0 of Social Security and Medicare tax saved, and the state tax saved (none in Pennsylvania, and in New Jersey only for a 401(k)) — licence
`ira_deduction_and_roth_limit`	Free worksheets; licence for the tax	Given MAGI, IRS Publication 590-A's worksheets line by line for 2026 or projected 2027: how much of a traditional IRA contribution is deductible and how much may go into a Roth IRA, including the spousal IRA rule — free; MAGI worked out from income, and the federal and state tax the deduction saves — licence
`standard_deduction_vs_itemizing`	Free deduction; licence for the comparison	The 2026 or projected 2027 standard deduction piece by piece (basic amount, age-65 and blind additions, a dependent's limit) and the senior deduction's rule — free; the senior deduction after its phase-out, the itemized total, the federal tax both ways and which is better — licence
`calculate_rmd`	Free RMD; licence for the tax	The 2026 or 2027 required minimum distribution, its divisor and deadline, the SECURE 2.0 start age, the first-year April 1 option and a multi-year projection — free. With a filing status and the year's other income it adds the federal and state tax the RMD adds, the Social Security it makes taxable, the IRMAA effect and what a QCD would take off — licence
`roth_conversion_tax_cost`	Licence	The federal and state tax a 2026 Roth conversion adds, its share of the amount converted and the cost of the next $1,000; the room left in the bracket and below the next IRMAA tier; flags for an IRMAA tier crossing, the tax torpedo and the senior-deduction phase-out
`qcd_tax_savings`	Licence	A 2026 gift made as a qualified charitable distribution compared with the same gift in cash: the federal and state tax and the IRMAA surcharge saved
`irmaa_check`	Free	The Medicare IRMAA tier a MAGI sets: the official 2026 tier and the 2027 and 2028 tiers on projected tables (labelled projected), with the monthly Part B and Part D surcharge per person, the annual total, and the distance to the next tier
`social_security_taxable_amount`	Licence	How much of 2026 Social Security is taxable, the tax the benefits cost, the marginal rate on the next dollar of other income and where the household sits in the tax torpedo
`capital_gains_tax`	Licence	The 2026 federal and state tax on short- and long-term gains or losses given other income: the room left in the 0% band and before the net investment income tax, the loss deducted and carried to 2027, and, given `harvest_loss`, the tax a harvested loss saves
`estimated_tax_payments_2026`	Licence	The 2026 safe-harbor required payment and per-installment amount, the four due dates, the Form 2210 underpayment and penalty for the payments as made, and, with the January installment open, the amount still due and the penalty if it is paid as an estimate, withheld in December or not paid
`aca_premium_tax_credit`	Free 2027 benchmark and cliff; licence for the credit	For 2027 coverage: the county benchmark premium from the CMS plan-year-2027 files, the poverty line, the 400% cliff income and the headroom below it — free; the 2027 credit and the credit lost by being $1 over the cliff — licence. For 2026 coverage: the credit at the state-level or a given benchmark, the expected contribution, the Medicaid and coverage-gap regimes and the cliff — licence

All twenty-two are read-only: they compute and return, and change nothing. Inputs are not kept after the run, except that a failed request is kept for two days to diagnose it.

What comes back with every number

A success rate is meaningless without its assumptions, and a summary will drop a caveat it was not handed explicitly. So each result states:

the return model that actually ran — reported by the engine, not by the request;
the number of paths and the real trial count behind the rate;
the income it assumed, including when it assumed none;
whether a correlation matrix had to be adjusted before running;
a plain warning when a run is not precise enough to show a client;
for the tax-aware tool: the spending convention (after tax — what the household keeps), every default assumed for an input that was not given, and the tax items the engine does not model.
for the every-state ranking: the engine versions, the federal tax it used for every state, the county taxes the state figures include, and every default assumed (spouse's age, how a couple's income is split, a private pension).
for the 2026 tax calculators: every default assumed for an input that was not given, what is projected rather than published (the 2027 and 2028 IRMAA tables, a 2027 tax year), and that the figure is an estimate, not tax advice.

Licence key

Optional. Without one, projections run at 2,000 paths (the 95% interval around a success rate is about ±1.5 points) and the tax-aware tool returns the first retirement year of its year-by-year schedule. A QuantCalc PRO key raises that to 10,000 paths (about ±0.7) and returns the full schedule. The tax engine inside the projections — withdrawal order, Roth conversions, state tax — needs no key.

The 2026 tax tools run on QuantCalc's licensed federal and state tax APIs and need a PRO or Tax Season Pass key: estimate_2026_tax_return, state_tax_in_every_state, calculate_2026_income_tax, pretax_contribution_savings, business_deduction_tax_savings, roth_conversion_tax_cost, qcd_tax_savings, social_security_taxable_amount, capital_gains_tax, estimated_tax_payments_2026, the tax part of calculate_rmd and the credit in aca_premium_tax_credit. Without a key they compute nothing and name the free web page for the same question (for example https://quantcalc.app/2026-tax-return-calculator/). irmaa_check, the RMD itself, the 2027 ACA benchmark, cliff and headroom, the retirement-plan contribution limit by age, the IRA deduction and Roth limit worksheets, and the standard deduction amount are free; the tax each of those saves needs a key. optimize_social_security_claiming needs a PRO key. The same key also unlocks the portfolio optimizer, glide paths, custom capital market assumptions and multi-period planning in the QuantCalc app. Those features are not tools in this plugin.

Set it in the plugin's configuration. It is sent as a connection header and never passes through the conversation.

Priva

Only the beginning is shown; read the rest in the repo

QuantCalc Retirement Engine

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Accounting, finance & taxi

Common questions

Alternatives

Finance Toolkit

SolidInvoice

Korea Tax Calculator

README from the maker

QuantCalc Retirement Engine — Claude plugin

Install

What's in the plugin

Tools

Retirement projections

2026 tax returns and calculators

What comes back with every number

Licence key

Priva