Retirement planning is often dominated by withdrawal rules, Monte Carlo probabilities, and portfolio‑centric heuristics. But none of these tools directly measure the core financial question every retired household faces: Can my assets support the lifetime spending I want—including the occasional big purchase—without jeopardizing long‑term solvency?
The actuarial answer is funded status.
Funded status compares the present value of what you have to the present value of what you plan to spend. It is the same solvency metric used by pensions, endowments, and insurers. When applied to households, it becomes a powerful, intuitive tool for managing both ongoing spending and significant one‑time decisions.
Why funded status is superior to withdrawal‑rate rules
Withdrawal rules treat retirement as a static math problem. Funded status treats it as a long‑term liability management exercise.
- A funded status above 100% means your assets can support your lifetime spending plan at today’s discount rates.
- A funded status below 100% means the plan is underfunded and requires adjustment.
- A funded status well above 120% indicates surplus capacity and flexibility.
This single number captures the entire retirement plan—timing of Social Security, longevity horizon, spending shape, discount rates, and market conditions. It is the closest thing retirees have to a solvency dashboard.
The missing piece in most retirement planning: non‑linear purchases
Most retirees don’t just spend smoothly. They buy cars. They remodel kitchens. They help adult children. They take major trips. They may even consider relocating.
These decisions are non‑linear—large, lumpy, and often emotionally driven. Traditional withdrawal rules offer no guidance on whether such purchases are affordable. Monte Carlo simulations can show probability impacts, but they rarely translate into a clear “yes, no, or how much.”
Funded status does.
Because funded status is a ratio of assets to liabilities, you can simply:
- Compute funded status today.
- Subtract the cost of the proposed purchase from assets.
- Recompute funded status.
- Evaluate the change.
Note that sometimes this calculation can be a little more complicated if the purchase is also expected to affect future cash flows. See our post of July 17, 2025 for the process under these conditions.
If funded status remains comfortably above 100% (or above your chosen threshold), the purchase is actuarially affordable. If it drops below your sustainability boundary, the purchase compromises long‑term solvency.
This is exactly how institutional plans evaluate discretionary spending. Households can use the same method.
Kitces.com’s perspective reinforces this actuarial approach
The June 7/8 2025 Kitces.com Weekend Reading post made this point clearly:
“In sum, financial advisors have more than one tool in their toolbelt when it comes to analyzing the impact of large purchases by their retired clients. And while advisors might not consider themselves to be actuaries, taking an actuarial approach could provide clients with a metric that allows clients to better understand the impact of potential purchases on the sustainability of their financial plan!”
This is precisely what funded status provides: a metric that translates a complex financial decision into a simple, interpretable measure of sustainability.
Funded status creates a dynamic feedback loop
Retirement is not static. Markets move. Rates shift. Spending evolves. A static withdrawal rule cannot respond to these dynamics. Funded status can.
By recalculating funded status periodically retirees gain a disciplined way to adjust spending:
- When markets rise or discount rates increase, funded status improves → spending can rise safely.
- When markets fall or discount rates decline, funded status deteriorates → spending should adjust downward.
- When a large purchase is contemplated, funded status instantly shows whether it is affordable.
This is how institutions manage long‑term promises. Retirees deserve the same rigor.
The bottom line
Retirement is a multi‑decade liability. It should be managed with tools designed for long‑term solvency. Funded status is the most accurate, comprehensive, and actionable measure for guiding retirement spending—including major one‑time purchases.
It reframes the central question from “How much can I withdraw?” to:
“What spending level—including large purchases—keeps my funded status stable over time?”
That is the actuarial approach. And it is the approach that gives retirees clarity, confidence, and control.
