Roth MAGI Phaseout Eligibility Checker

Conditional RothMAGIlinear-phaseout amount using caller year/status limits; statutory contribution rounding/minimum external, not legal eligibility. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.

Description

A linear Roth contribution phaseout model combines MAGI with supplied full and zero-contribution boundaries.

A linear Roth contribution phaseout model combines MAGI with supplied full and zero-contribution boundaries.^[1]

It gives a conditional arithmetic amount while leaving statutory rounding and eligibility rules to the applicable reference.

When to use Roth MAGI Phaseout Eligibility Checker

Use this tool when you need to reproduce the stated calculation from measured records or independently selected model inputs. Establish jurisdiction, tax year, applicable authority, and eligible amounts or evidence before entering values. Minor-unit amounts use one currency; 12345 means 123.45 when that currency has 100 minor units per major unit. One basis point is 0.01 percentage points.

How to use Roth MAGI Phaseout Eligibility Checker and understand its results

Establish jurisdiction, tax year, applicable authority, and eligible amounts or evidence before entering values. Minor-unit amounts use one currency; 12345 means 123.45 when that currency has 100 minor units per major unit. One basis point is 0.01 percentage points.
Enter magiMinor, callerFullContributionBoundaryMinor, callerNoContributionBoundaryMinor, callerFullContributionMinor, following the field table and rules below, then run the tool.
Read conditionalPhaseoutContributionMinor, callerIncomeBand. Use the output meanings below to interpret units, signs, flags, and any nested result fields.
Correct reported input issues and run again. For a successful result, check the stated evidence coverage and assumptions before using it in your review.

Input field	Meaning	Value type	Requirement
magiMinor	MAGI minor	number	Required
callerFullContributionBoundaryMinor	Caller full contribution boundary minor	number	Required
callerNoContributionBoundaryMinor	Caller no contribution boundary minor	number	Required
callerFullContributionMinor	Caller full contribution minor	number	Required

Use nonnegative safe-integer MAGI, both boundaries, and full contribution. The upper boundary must strictly exceed the lower. At or below lower return full; at or above upper return zero; between them round the remaining linear fraction to minor units and label the band phaseout.

available=round(fullContribution×(upper−MAGI)/(upper−lower)) within phaseout

Symbols follow the input and output meanings and the calculation rules above.

Output field	Meaning	Value type
conditionalPhaseoutContributionMinor	Conditional phaseout contribution minor	number
callerIncomeBand	Caller income band	string

json

{
  "input": {
    "magiMinor": 150,
    "callerFullContributionBoundaryMinor": 100,
    "callerNoContributionBoundaryMinor": 200,
    "callerFullContributionMinor": 60
  },
  "output": {
    "conditionalPhaseoutContributionMinor": 30,
    "callerIncomeBand": "phaseout"
  }
}

Limitations and assumptions

Eligibility, rates, dates, definitions, and exceptions are independently supplied facts. The arithmetic is not a complete return calculation or a determination of tax liability.

Missing required fields, unknown fields, wrong types, and violated calculation rules are input issues. Numeric values must be finite; nonfinite results are rejected. Monetary products and sums use checked integer arithmetic; fractional minor amounts are rounded to nearest, with half ties away from zero. Rates and amounts must satisfy the tool-specific bounds above.

Alternative or Complementary methods

For a related review, use IRA Contribution Limit Catchup Age Lookup: IRA contribution and catch-up limits depend on year, age, and account type. This lookup retrieves your verified notice without hardcoding current amounts. For a complementary step, use Backdoor Roth Pro Rata Basis Warning Checker: A backdoor Roth scenario can contain both pretax IRA amounts and after-tax basis. Aggregating those supplied components shows a conditional taxable conversion share and whether both components coexist.

References

Roth MAGI Phaseout Eligibility Checker — tool.io

Similar or alternative tools

IRA Contribution Limit Catchup Age Lookup
IRA contribution and catch-up limits depend on year, age, and account type. This lookup retrieves your verified notice without hardcoding current amounts.
Backdoor Roth Pro Rata Basis Warning Checker
A backdoor Roth scenario can contain both pretax IRA amounts and after-tax basis. Aggregating those supplied components shows a conditional taxable conversion share and whether both components coexist.