About the Pension Division in Divorce Calculator
This pension division calculator works out how a defined-benefit pension is typically split in a divorce. It applies the coverture fraction — months of pension service earned during the marriage divided by total months of service — to the monthly benefit, then gives the former spouse their percentage of that marital portion. You see the marital share, the monthly amount each spouse receives and an estimate of what the former spouse’s share is worth as a lump sum today.
It is meant for divorcing spouses, mediators and attorneys preparing a property settlement or a qualified domestic relations order (QDRO). Knowing the present value helps you decide whether to divide the pension itself or trade it for other assets, such as more home equity.
Assumptions: the coverture method is used (the most common approach for defined-benefit plans in US courts), the benefit is a level monthly amount starting at retirement, and the present value uses your chosen discount rate and payout period with no cost-of-living adjustments or survivor reductions. State law, the plan’s rules and the wording of the QDRO decide the final split; defined-contribution plans like 401(k)s are divided by account balance instead.
With the default inputs, the former spouse’s monthly benefit is $900.00. Change any value above to recalculate instantly.
How to use the pension division in divorce calculator
- 1Enter the monthly pension benefit from the plan statement.
- 2Enter months of service during the marriage and total months of service.
- 3Enter the former spouse’s share of the marital portion (often 50%).
- 4Add the years until payments start, expected years of payments and a discount rate.
- 5Read each spouse’s monthly benefit and the present value of the award.
Formula and method
The coverture fraction measures how much of the pension was earned while married: the months of credited service between the wedding and the cut-off date (often separation or filing) divided by total months of service. Multiplying the monthly benefit by the fraction gives the marital portion, and the former spouse’s award is a percentage of that portion — usually 50% in community-property and many equitable-distribution states.
To value the award as a lump sum, the calculator treats the spouse’s monthly payment as a level annuity for the expected payout period, discounts it at the monthly rate r = annual rate ÷ 12, and then discounts that value back to today over the months d until payments start. A higher discount rate or later start lowers the present value.
- CF
- Coverture fraction
- Share
- Former spouse’s percentage of the marital portion
- r
- Monthly discount rate
- n, d
- Months of payments and months until payments start
Worked examples
15 of 25 years married, 50% split
180 of 300 months were earned during the marriage, a 60% coverture fraction, so $1,800 of the $3,000 benefit is marital. Half of that, $900 a month, goes to the former spouse. Paid for 20 years and discounted at 5%, it is worth about $136,373 at retirement, or about $82,800 today, ten years earlier.
Short marriage, already retired
Ten of thirty years of service fall within the marriage, so one-third of the $2,500 benefit ($833.33) is marital and the spouse receives $416.67 a month. Over 25 years at 4%, that stream is worth about $78,939 today.
Entire career during the marriage, 40% award
All service was during the marriage, so the whole $4,200 is marital and a 40% award is $1,680 a month. Twenty years of payments at 6% are worth $234,496 at retirement and about $173,849 today, five years before payments begin.
Frequently asked questions
What is the coverture fraction?+
It is the share of a pension earned during the marriage: months of service while married divided by total months of service. Courts commonly multiply the benefit by this fraction to find the marital portion, then split that portion between the spouses.
What is a QDRO?+
A qualified domestic relations order is a court order that tells a private-sector retirement plan to pay part of a participant’s benefit to a former spouse (the alternate payee). Government and military plans use similar orders under their own rules.
Is a pension always split 50/50 in divorce?+
Not always. Community-property states generally split the marital portion equally, while equitable-distribution states divide it fairly, which is often but not always 50/50. Spouses can also agree to a different split or trade the pension for other assets.
Should I take a lump sum or share the monthly payments?+
A lump-sum offset gives a clean break and immediate assets, while a shared-payment order spreads investment and longevity risk. The present value here helps compare the two, but the discount rate used can change the answer significantly.
Does the coverture fraction apply to a 401(k)?+
Usually not. Defined-contribution accounts like 401(k)s are divided by the account balance accumulated during the marriage, including its growth, rather than by a service-time fraction of a future monthly benefit.
Results are general estimates and not legal advice. Laws vary by jurisdiction — consult a qualified attorney.