VA disability ratings are not added together — the VA reads your combined rating off the Combined Ratings Table in 38 CFR § 4.25, combining one condition at a time and applying each to the capacity that remains, not the original 100%. That is why 50% + 30% + 20% produces a 70% combined rating under VA math, not 100%. Understanding where a combined rating sits in the compensation table before filing additional claims helps identify which conditions would actually move it to the next tier — a distinction that can mean several hundred dollars per month in the difference.
Quick Answer
- VA disability ratings do NOT add together — the VA uses the § 4.25 Combined Ratings Table, applying each rating to what's left, not the original 100%
- 50% + 30% + 20% combines to 72 under VA math, which rounds down to 70% — not 100%
- Whether a new 10% condition changes your check depends on where your combined value sits — at a 57 (60%) it can be $0; at a 72 (70%) the same 10% crosses 75 and jumps you to 80%
- At a 72 (70%) combined value, adding a 20% condition produces 78, which rounds up to 80% — a difference of $293.70/month ($3,524/year) at 2026 rates
- The bilateral factor applies when both sides of a paired arm or leg are rated above 0% — it adds 10% of the combined value (rounded to a whole number) and can push a veteran to the next tier
- Understanding the math before you file additional claims helps you target conditions that will actually move your combined rating to the next tier
The examples below use real 2026 VA compensation rates for illustration — actual combined ratings and compensation depend on individual service-connected conditions, VA claim decisions, and personal circumstances.
Why does adding your VA ratings together give you the wrong combined rating?
A veteran files three claims. The rating decision comes back: 50%, 30%, 20%. They add them up: 50 + 30 + 20 = 100. They expect a 100% combined rating. Instead, the letter says 70%.
This is not an error. It is the intended result of the VA's combined rating formula, defined in 38 CFR § 4.25. Understanding why it works this way — and more importantly, knowing when an additional condition actually changes your compensation — is one of the most practically valuable things any veteran can know about the claims process.
How does the VA's whole person framework calculate combined disability ratings?
The VA reads combined ratings off the § 4.25 Combined Ratings Table. That table is built on the "whole person" idea: you begin at 100% capacity, and each rating is applied to the capacity that remains, not the original 100%. The VA works down the table one condition at a time, highest rating first — and every step lands on a whole number.
This creates diminishing returns with each additional condition.
Step-by-Step: 50% + 30% + 20%
Sort the ratings highest first, then combine them on the table one at a time:
- Combine the top two: 50 & 30 → 65
- Combine that with the next: 65 & 20 → 72
- Convert to the nearest 10%: 72 → 70%
VA rounding rule: The final combined value is converted to the nearest 10%. Values with a ones digit of 1–4 round down; ones digit of 5–9 rounds up. The threshold between two tiers is the midpoint: for the 70% and 80% tiers, a combined value of 74 or below rounds to 70% and 75 or above rounds to 80%.
The veteran with three conditions rated 50%, 30%, and 20% receives a 70% combined rating — not 100%.
What Adding Another Condition Does
Here is where understanding the math becomes a financial planning tool — and where the same rating can be worth wildly different amounts.
Consider a veteran at a 60% combined rating: 40% + 20% + 10%. On the table, 40 & 20 → 52, then 52 & 10 → 57, which rounds to 60% ($1,435.02/month in 2026, veteran alone).
Adding a 10% Condition
- Work down the table: 40 & 20 → 52, 52 & 10 → 57, 57 & 10 → 61
- Rounds to: 60%
Adding a 10% condition here: $0 change in monthly compensation. The combined value moves from 57 to 61, but both round to 60%. The new condition is still rated and documented — which matters for establishing service connection on something that may worsen later — but it produces no immediate increase.
Adding a 20% Condition
- Work down the table: 40 & 20 → 52, 52 & 20 → 62, 62 & 10 → 66
- Rounds to: 70%
Adding a 20% condition jumps the combined rating from 60% to 70% — +$373.43/month ($1,808.45 − $1,435.02), or $4,481/year, tax-free. Over 30 years that is roughly $134,000 in additional compensation.
The same 10% rating, two different results. The veteran above (combined value 57) gets $0 from a new 10% condition. But a veteran whose combined value is 72 — say, 50% + 30% + 20%, which also rounds to 70% — adds that identical 10% and lands on 75, crossing into 80%: +$293.70/month, or $3,524/year. The same 10% rating is worth nothing to one veteran and $3,524/year to another, purely because of where their combined value already sits. That is why you run the table, not your gut.
2026 VA compensation rates (veteran alone):
- 60%: $1,435.02/month
- 70%: $1,808.45/month
- 80%: $2,102.15/month
| Action | Combined Result | Monthly Rate | Annual |
|---|---|---|---|
| 40% + 20% + 10% (baseline) | 60% | $1,435.02 | $17,220 |
| + 10% condition | 60% (no change) | $1,435.02 | $17,220 |
| + 20% condition | 70% | $1,808.45 | $21,701 |
2026 VA compensation rates, veteran alone. Add dependent adjustments at 30%+.
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Calculate your 2026 combined VA rating step by step — and see how additional conditions would change your monthly compensation.
Open Calculator →What is the bilateral factor and how does it add a bonus to your VA combined rating?
There is one significant exception to the basic combined ratings formula: the bilateral factor.
When it applies: If a veteran has service-connected conditions on both sides of a paired arm or leg — both knees, both ankles, both shoulders, both arms, and so on — and both sides are rated above 0%, the VA combines those bilateral conditions, adds an additional 10% of that combined value, and rounds to the nearest whole number before applying the result to other ratings.
Example: A veteran has:
- Left knee: 20%
- Right knee: 20%
Step 1 — Combine the bilateral knees on the § 4.25 table:
- 20 & 20 → 36
Step 2 — Apply the bilateral factor (+10% of the combined bilateral value):
- 10% of 36 = 3.6 → 36 + 3.6 = 39.6 → rounds to 40 → 40%
In this example, 36 without the bilateral factor also rounds to 40% — same result. The factor matters most when the combined bilateral value sits near a rounding boundary. For instance, two knees at 30% and 20% combine to 44 (rounds to 40%). With the bilateral factor: 10% of 44 = 4.4 → 48.4 → rounds to 48 → 50%. That one-tier difference — 40% to 50% — is worth $337.06/month ($4,045/year) at 2026 rates.
What This Means for Filing
The combined ratings formula has direct implications for how veterans can approach additional claims:
Read the next step straight off the table. Once your current conditions are combined, you can see exactly what a new rating does. A 10% condition added to a combined value of 57 lands on 61 (still 60%); the same 10% added to 72 lands on 75 (80%). A new rating only changes your check when it crosses a rounding threshold.
How much it takes to cross depends on where you sit. At a combined value of 72, even a 10% condition reaches 75 and rounds to 80%. At 57, a 10% only reaches 61 — you would need a 20% to reach 66 and round to 70%. The closer your combined value is to a midpoint (a value ending in 5), the less it takes to cross into the next tier.
Bilateral conditions on both sides of a paired joint are each worth filing. The bilateral factor can be the difference between one rating tier and the next, and it requires both sides to be rated above 0%.
Conditions rated at any level are worth documenting. Even if a 10% condition doesn't immediately move your combined rating, it establishes service connection for a condition that may worsen later. The dollar impact today may be $0; the impact when the condition worsens may be significant.
How much does your monthly VA compensation change at each rating tier?
At 2026 VA compensation rates (veteran alone), here's what each tier boundary is worth:
| Rating Jump | Monthly Increase | Annual Increase |
|---|---|---|
| 60% → 70% | +$373.43 | +$4,481 |
| 70% → 80% | +$293.70 | +$3,524 |
| 80% → 90% | +$260.15 | +$3,122 |
| 90% → 100% | +$1,576.28 | +$18,915 |
The 90% to 100% jump is exceptional — $1,576/month more — which reflects both the P&T (Permanent and Total) designation that typically accompanies 100% ratings and the dramatically higher compensation rate for total disability.
The Takeaway
VA math is not intuitive, and most veterans filing their first claims expect their ratings to add up normally. They do not — by design. The § 4.25 table reflects a diminishing-returns model: each additional disability is applied to whatever functional capacity remains, not to the original 100%. Reaching 100% through accumulated individual ratings is nearly impossible under this model.
What is possible: understanding where your current combined value sits, identifying which new conditions would cross a rounding threshold, and filing accordingly. The difference between 70% and 80% is $3,524/year in tax-free income. The difference between 80% and 90% is another $3,122/year.
For a complete walkthrough of how VA combined ratings are calculated step by step, see VA Disability Math Explained.
The VA Disability Calculator runs the combined ratings formula automatically — enter your individual ratings in any order and see the combined result with 2026 compensation amounts.
