How to Use a 401(k) Calculator Before Changing Jobs

A Job Change Can Quietly Reshape Your Retirement Plan

Salary-only comparisons miss retirement value differences. Match structure and contribution behavior can materially change long-term compensation.

New salary, new match rules, and vesting cutoffs can change the value of a move more than people expect. It is worth checking the retirement impact before you focus only on base pay.

Test the Old Plan Against the New One

Start with your current salary, balance, contribution rate, employer match, and expected retirement age. Then compare at least two versions of the same plan instead of trusting a single projection.

Compare your current setup with the new employer's match, vesting schedule, and likely contribution rate. That will not make the decision for you, but it will keep one important piece of the offer from staying invisible.

Use the calculator to pressure-test the choice, then confirm any plan-specific details in your employer documents when those details affect the outcome.

Frequently Asked Questions

1. Should I compare 401(k) details across offers?

Yes, especially match formulas and plan participation terms.

2. What if full plan details are missing?

Model rough assumptions first, then refine when documents are available.

3. What does the calculator add?

It converts benefit structure into projected dollar impact.