Adjusted Cost Basis (ACB) of a Life Insurance Policy | LLQP Guide

Why ACB is the master concept

If you could carry only one idea from the taxation module into the exam room, it should be this: adjusted cost basis (ACB) is the line between tax-free and taxable money in a life insurance policy. Every tax answer in this topic — surrenders, withdrawals, policy loans, corporate CDA credits — is computed by measuring the transaction against the policy's ACB.

The intuition: ACB tracks how much of the policy's value has already been paid for with after-tax dollars. The tax system lets you recover that much tax-free; anything above it is the policy's untaxed gain, and extracting it triggers tax.

How ACB is built (simplified)

The full statutory formula is long, but the exam needs the shape of it:

• Add: premiums paid into the policy.
• Subtract: the net cost of pure insurance (NCPI) — the annual cost of the death benefit protection itself.
• Add: policy dividends left on deposit and certain taxable policy gains already recognized.
• Subtract: dividends paid out or applied against premiums, previous policy loans and withdrawals (the ACB slices that left with them).

The result is a curve that rises early (premiums exceed insurance costs in the early years) and falls later (NCPI grows with age while premiums stay level, so the cost of insurance eats the basis). In mature policies ACB frequently reaches zero — and stays there, because ACB cannot be negative.

That declining shape explains three classic exam facts at once: old policies produce big taxable gains on surrender, old policies credit the CDA almost fully at death, and policy loans late in life are usually taxable.

Where ACB shows up

Worked example 1: full surrender

Nadia surrenders her whole life policy:

• Cash surrender value: $90,000
• ACB: $38,000

Taxable policy gain: $90,000 − $38,000 = $52,000, included fully in income (not a capital gain — no partial inclusion). If her ACB had been $95,000 instead, the result is $0 taxable — and the $5,000 shortfall is not a deductible loss. Policy losses are never deductible; that asymmetry is a standard exam trap.

Worked example 2: partial withdrawal (proportional rule)

Omar's universal life policy, just before a withdrawal:

• Cash value: $100,000
• ACB: $40,000

He withdraws $25,000.

1. Fraction of value withdrawn: $25,000 ÷ $100,000 = 25%.
2. ACB slice that leaves with the withdrawal: 25% × $40,000 = $10,000.
3. Taxable gain: $25,000 − $10,000 = $15,000.
4. Policy after: cash value $75,000, ACB $30,000.

The trap answers: "$25,000 fully taxable" (ignores ACB) and "$0 — he paid for it" (ignores the embedded gain). The proportional formula is the most commonly tested calculation in this module — practise it until automatic. More UL context in accrual taxation and universal life.

Worked example 3: policy loan

Same policy: ACB $40,000, cash value $100,000. Omar instead takes a policy loan of $70,000 from the insurer.

• Taxable portion: $70,000 − $40,000 = $30,000 of income in the year of the loan.
• If he repays the loan, he gets a deduction for amounts previously taxed as loan income — but the tax timing already happened.

Had he assigned the policy to a bank for a $70,000 collateral loan, the taxable amount would be $0 — no disposition occurs.

Worked example 4: ACB at death (CDA)

A corporation owns a policy on its founder: death benefit $750,000, ACB $0 (a mature policy where years of NCPI eroded the basis).

• Death benefit to the corporation: tax-free.
• CDA credit: $750,000 − $0 = $750,000 — the entire benefit can flow to shareholders as a tax-free capital dividend. Full picture in corporate-owned life insurance.

Exam traps summary

• ACB is not premiums paid. Premiums minus NCPI (and other adjustments) — students who equate the two get every calculation wrong.
• ACB cannot go below zero. Once it hits zero, all extracted value is fully taxable.
• Gains are income, not capital gains. Full inclusion, no preferred rate.
• Losses are not deductible. ACB above proceeds yields $0, not a deduction.
• Death benefit ignores ACB for personal beneficiaries — ACB only resurfaces for the corporate CDA credit.

How to study ACB

1. Sketch the two curves (cash value rising; ACB rising then falling to zero) until you can reproduce them from memory.
2. For any scenario, ask: is this a disposition? If yes, find ACB and apply the formula. If no (bank collateral loan, death benefit to an individual), ACB is a decoy.
3. Do the proportional-withdrawal calculation five times with different numbers — it is near-guaranteed exam material.

ACB connects this whole cluster: it explains why the exempt test matters, why death benefits escape tax while surrenders do not, and why the CDA works — all mapped in the Life Insurance Taxation hub.