How to Calculate Your Aging-in-Place vs Assisted Living Cost Crossover: A $128,920 Swing Between Fast and Slow ADL Decline (September 2026)
Here is a question I hear a lot: "Mom needs help bathing and getting out of a chair. Is it cheaper to keep her home or move her to assisted living?"
The honest answer is that it depends on how fast she declines. In the example below, the same house, the same aide rate, and the same facility give a $124,965 advantage to aging in place if decline is slow. If decline is fast, they give a $3,955 advantage to assisted living. That is a $128,920 swing from one variable, and it's why "just keep her home, it's cheaper" and "just move her, it's safer" are both rules of thumb that fail for some families.
This post walks through the calculation step by step so you can see which inputs matter. It's a worked example, not a forecast. The dollar figures are assumptions I've labeled, and yours will be different.
What September 2026's Data Says About Your Inputs
Every crossover model needs a few macro inputs: how fast care wages grow, how fast facility fees grow, and what your money costs. The latest numbers:
| Indicator | Latest reading | What it feeds in your model |
|---|---|---|
| CPI (Bureau of Labor Statistics, Aug 2026) | +0.4% for the month | Facility fee escalation, home carrying costs |
| Average hourly earnings (BLS, Aug 2026, preliminary) | +$0.10 | Aide wage growth |
| Unemployment rate (BLS, Aug 2026) | 4.1% | Aide availability and agency pricing power |
| Payroll employment (BLS, Aug 2026, preliminary) | +162,000 | Labor market tightness |
| Mortgage rates (NerdWallet, Sept 18, 2026) | No change, as bond markets digest the week's Fed news | Your HELOC or borrowing cost |
Two quick conversions turn these into model inputs:
- CPI of 0.4% a month, annualized: 1.004¹² = 1.049, or about 4.9% a year. One month is noisy, but it tells you not to assume inflation has gone away.
- A $0.10 hourly wage bump applied to a $33 aide rate: $0.10 ÷ $33 = 0.30% a month, or about 3.7% annualized. The $0.10 is an all-worker average, not an aide-specific figure, so I'm using it only as a rough guide.
I'll assume 4% annual growth for both aide wages and facility fees, which sits between those two readings. Then I'll test 5%, because wage growth is the input most likely to be wrong.
The NerdWallet mortgage piece doesn't give me a rate I can build a model on, so I'm using 7% as an assumed borrowing cost and discount rate. Replace it with your actual HELOC or opportunity rate.
The Worked Example: "Margaret," 78, Two ADL Losses
This is a constructed example, not real client data. Margaret owns her home outright. She needs help with bathing and transferring, and she's likely to lose more ADLs over time. The assumptions:
| Input | Assumption |
|---|---|
| Home aide rate | $33/hour in Year 1, growing 4%/year |
| Home modifications (bathroom, ramp, grab bars) | $22,000 upfront |
| Home carrying costs (property tax, insurance, maintenance, utilities, supplies) | $18,000/year, growing 4% |
| Assisted living base fee | $6,200/month ($74,400/year), growing 4% |
| Assisted living community fee | $5,000 upfront |
| Assisted living care-level add-on | Rises with ADL losses (schedule below) |
| Discount rate | 7% |
| Horizon | 5 years |
The NPV formula: upfront costs + the sum of each year's cost × 1.07⁻ᵗ, where t is the year. A dollar spent in Year 4 counts as 76 cents today.
I've covered the formula in more depth in this 5-step NPV walkthrough, so here I'll focus on how the answer moves.
Path A: Fast ADL Decline
Care hours per week climb 20 → 30 → 42 → 56 → 70. Assisted living add-ons run $900, $1,300, $1,800, $2,400, and $3,000 a month.
| Year | Aide hrs/week | Aging in place (care + carrying) | Assisted living (base + add-on) | Home minus AL |
|---|---|---|---|---|
| 1 | 20 | $52,320 | $85,200 | −$32,880 |
| 2 | 30 | $72,259 | $92,976 | −$20,717 |
| 3 | 42 | $97,422 | $102,071 | −$4,649 |
| 4 | 56 | $128,342 | $112,490 | +$15,853 |
| 5 | 70 | $161,581 | $123,037 | +$38,543 |
Add the upfront costs ($22,000 for modifications, $5,000 for the community fee) and discount at 7%:
- Aging in place NPV: $426,652
- Assisted living NPV: $422,697
- Gap: $3,955 in favor of assisted living
Three things stand out.
1. The annual crossover comes in Year 4, but the cumulative crossover comes in Year 5. Aging in place is cheaper for three straight years and builds a lead of about $35,620 in present-value terms by the end of Year 3. Then Years 4 and 5 give it back.
2. Timing matters. Adding up the raw dollars says assisted living wins by $13,150 ($533,924 vs $520,774). Discounting shrinks that to $3,955, because the home savings come early and the home overspend comes late. A spreadsheet that skips discounting will overstate the case for moving.
3. Seventy hours a week is a warning sign, not a plan. Past roughly 56 hours, you're close to needing someone present overnight. Round-the-clock coverage at $33 an hour is $288,288 a year before wage growth (168 hours × 52 weeks × $33). The home column gets much less reliable after Year 3.
This is the kind of analysis Dorevanti runs for you, so you don't have to build the spreadsheet yourself.
Path B: Slow ADL Decline
Care hours per week climb 15 → 18 → 21 → 25 → 29. Assisted living add-ons run $900, $900, $1,100, $1,300, and $1,500 a month.
| Aging in place | Assisted living | |
|---|---|---|
| Year 1 cost | $43,740 | $85,200 |
| Year 5 cost | $79,274 | $105,037 |
| 5-year NPV | $263,779 | $388,744 |
| Gap | $124,965 in favor of aging in place |
In Path B the lines never cross. Even at 29 hours a week in Year 5, home costs $79,274 against $105,037 for assisted living.
| Scenario | Winner | NPV gap |
|---|---|---|
| Slow ADL decline | Aging in place | $124,965 |
| Fast ADL decline | Assisted living | $3,955 |
| Swing between them | $128,920 |
For more on why the speed of decline outweighs almost everything else, see this fast-vs-slow comparison.
Sensitivity: Three Inputs That Move the Answer
I re-ran the fast-decline path, the close call, with three changes.
Life expectancy and horizon. This is the input people skip.
| Horizon | Fast-decline result |
|---|---|
| 1 year | Aging in place cheaper by $13,730 |
| 2 years | Aging in place cheaper by $31,825 |
| 3 years | Aging in place cheaper by $35,620 |
| 4 years | Aging in place cheaper by $23,526 |
| 5 years | Assisted living cheaper by $3,955 |
If a 78-year-old's realistic horizon is 3 years, aging in place wins by $35,620. If it's 8 to 10 years, the tail dominates and assisted living looks better. A health-adjusted life expectancy turns a generic answer into your answer.
Wage growth. If aide wages grow 5% instead of 4%, the home NPV rises by about $7,990. The assisted living advantage grows from $3,955 to roughly $11,945. The BLS wage and CPI readings above sit on both sides of my 4% assumption, so it's worth testing both.
Discount rate. Moving from 7% to 5% raises the home NPV to $453,716 and the assisted living NPV to $447,596. The assisted living advantage grows to $6,120, because a lower rate puts more weight on the expensive late years. If your alternative to spending the money is a HELOC at a higher rate, later costs shrink and home looks better.
In this example the direction of every sensitivity is the same: the tail matters, so the inputs that stretch the tail (longer horizon, faster wage growth, lower discount rate) push toward assisted living.
What This Model Leaves Out
A 5-year home-vs-assisted-living model is a starting point. Five things can change the answer.
Memory care and nursing home. If the fast path involves cognitive decline, assisted living may not be the endpoint. Memory care and skilled nursing usually cost more than assisted living, so the facility column in Path A may be too low. See aging in place vs nursing home at three ADL levels for that side of the math.
Medicaid spend-down. Medicaid long-term care coverage is means-tested, and most states use a 60-month look-back for asset transfers. Giving money away to qualify can trigger a penalty period. This matters most if your horizon includes nursing-home-level care, so model it before you move assets, not after.
VA Aid & Attendance stacking. Suppose an eligible veteran received $1,800 a month, or $21,600 a year (an illustrative figure, not the current rate). Because it can offset home care or assisted living, it lowers both columns and barely moves the gap. What it does change is the monthly cash flow and how long the money lasts. VA has its own look-back and net-worth rules that interact with Medicaid planning. Our VA Aid & Attendance calculator walkthrough covers the mechanics.
Hidden costs. Home insurance, groceries, and repairs are already partly in my $18,000 carrying line, but they're easy to under-count. See the hidden-cost breakdown. I've also ignored home sale proceeds, which would change the assisted living side of the ledger.
"Free money" strings. NerdWallet's "Locked Out: Should You Take 'Free Money' to Buy a Home?" says homebuying assistance can lower upfront costs but comes with trade-offs. That logic applies to home-modification grants, forgivable loans, and state waiver programs too. I haven't verified how any given program works, so read the terms for liens, occupancy requirements, or repayment triggers if Margaret moves out early. A $22,000 modification that turns into a lien changes the NPV.
Two smaller family-side costs belong in the home column. If adult children fly in to coordinate care, that travel is a real expense, and NerdWallet's piece on earning a million points through an airline-branded cruise portal is a reminder that points strategies can offset some of it. And if a family member is thinking of cutting hours to be the caregiver, the price of that care is their after-tax wage. If it's higher than $33 an hour, paid help may be the cheaper option. NerdWallet's side-hustle quiz is one place to look if the caregiver needs to keep some income flowing.
Your Numbers Will Differ
Everything above is a worked example. Margaret's $22,000 modification, $6,200 base fee, and 4% growth are assumptions I chose. Your situation will change the answer. Five inputs decide most of it:
- Your ADL decline curve. Which ADLs are lost now, and how fast are more likely to follow? Two ADL losses today can mean very different Year 5 hours.
- Local aide rate and facility fees. A $33 rate and a $6,200 base fee may be far from what you'd pay.
- Your house. A ranch with a step-free entry costs less to modify than a three-story with a narrow bath. Whether it's paid off or carries a HELOC at your real rate changes the discount rate.
- Your horizon. Health-adjusted life expectancy can move the result by tens of thousands of dollars, as the horizon table shows.
- Benefits and eligibility. VA Aid & Attendance, long-term care insurance, and Medicaid planning all need to be in the model before you commit.
If your inputs look like Path B, the numbers may say to stay home. If they look like Path A, the numbers may say to plan the move before a crisis forces it. Either way, the September 2026 readings (CPI up 0.4%, a 4.1% unemployment rate, and rates that paused on Sept 18) mean the inputs are still shifting, so it's worth running the math with current figures.
If you'd like to see where your family lands, you can model this for your specific situation at Dorevanti. Enter your ADL status, local costs, and time horizon, and it calculates the crossover point for you. Nothing here is meant to push you toward one answer. The point is to make the decision on numbers rather than a rule of thumb.
Sources
- Locked Out: Should You Take ‘Free Money’ to Buy a Home? — NerdWallet
- Major Economic Indicators Latest Numbers — Bureau of Labor Statistics
- How I Earned 1 Million Points With My Family Cruise Booking — NerdWallet
- Quiz: What’s the Best Way to Make Money? — NerdWallet
- Mortgage Rates Today, Friday, September 18: No Change — NerdWallet