FFO vs AFFO: How to Explain and Compare in Interview

Introduction

"What is the difference between FFO and AFFO" is one of the most reliable technical questions in a REIT interview, and most candidates answer it as a vocabulary test: FFO adds back depreciation, AFFO adjusts FFO further. That is correct and almost worthless, because it does not explain why either metric exists or which one you would actually trust. The strong answer treats the two as a story about getting from a misleading accounting number to the real cash a REIT can pay out. FFO fixes the depreciation distortion that makes net income useless for property companies; AFFO then strips out the spending FFO conveniently ignores. The candidate who can say which number reveals whether a dividend is safe, and why, has answered the question the interviewer was actually asking.

The starting point is the problem FFO was invented to solve. Real estate carries enormous non-cash depreciation, so a building that is appreciating in market value shows up on the income statement as if it were steadily wearing out. That charge crushes reported net income and makes EPS a poor guide to how much cash a REIT actually generates. The industry's response, standardized by NAREIT in 1991, was funds from operations: take net income, add back real estate depreciation and amortization, and remove gains and losses on property sales so that one-time dispositions do not distort the recurring picture.

Funds From Operations (FFO)

FFO is the NAREIT-standardized measure of a REIT's recurring operating performance, calculated as net income plus real estate depreciation and amortization, minus gains on property sales, plus losses on property sales. It exists because depreciation makes GAAP net income an unreliable measure of a property company's cash generation.

The reason this belongs in your answer is that it frames FFO as a fix, not an arbitrary metric. You can say: net income understates a REIT because of non-cash depreciation, so FFO adds that depreciation back to approximate recurring cash earnings. That single sentence shows you understand the why, and it sets up the natural follow-up, which is what FFO still gets wrong. The deeper treatment of this distortion lives in why GAAP understates REIT economics, part of the broader real estate and REIT valuation toolkit that replaces EPS-based analysis.

Core FFO and Normalized FFO: FFO's Cousins

One nuance separates strong candidates here. Because NAREIT FFO is prescriptive, it is hard to massage, so many REITs also report a Core FFO or Normalized FFO that strips out items management deems one-time: transaction costs on acquisitions, losses on early debt extinguishment, storm damage, or other non-recurring charges. Used honestly, these adjusted figures isolate the run-rate earning power of the portfolio. Used aggressively, they let a company relabel recurring costs as one-offs to flatter the headline, and because they sit outside the NAREIT definition they are not comparable across companies. If an interviewer asks for the difference between FFO and Core FFO, the answer is that NAREIT FFO is standardized while Core FFO is company-defined, which makes Core FFO useful for reading a single REIT's own trend but unreliable for comparing one REIT against another.

FFO is an improvement, but it overcorrects. By adding back all depreciation, it implicitly assumes a building needs no ongoing investment to keep earning, which is false. Real properties require recurring spending to stay competitive: new roofs and HVAC, carpet and appliances in apartments, and the leasing costs and tenant improvement allowances needed to keep space occupied. FFO ignores all of it. AFFO, adjusted funds from operations, corrects for that by subtracting the real cash drains FFO leaves in.

The Three Adjustments

There are three standard adjustments. The largest is recurring maintenance capital expenditure, the ongoing spend to keep existing properties income-ready, as opposed to growth capex that builds new income. The second is straight-line rent, the GAAP convention that spreads contractual rent evenly across a lease term; AFFO reverses it to reflect cash rent actually collected. The third is leasing costs and tenant improvements, the capitalized cost of signing and retaining tenants. The result is a number that approximates the cash a REIT could actually distribute.

Adjusted Funds From Operations (AFFO)

AFFO is FFO minus the recurring capital and timing items FFO ignores: maintenance capex, the straight-line rent adjustment, and leasing costs and tenant improvements. It approximates the sustainable cash a REIT can pay out, and unlike FFO it has no single standardized definition, so it varies by company.

A terminology note worth having ready: AFFO travels under several names. Some REITs report funds available for distribution (FAD) or cash available for distribution (CAD), and while the precise adjustments differ at the margins, all three describe the same idea, the recurring cash left for shareholders after the portfolio's real capital needs. If an interviewer uses FAD or CAD, treat it as AFFO unless told otherwise, and note that the very multiplicity of names is itself a symptom of the missing standardized definition.

The cleanest way to make this concrete is to walk the bridge from net income down to AFFO on a per-share basis, naming each adjustment as you go.

The fuller mechanics of the build, including where each adjustment comes from in the filings, are covered in from FFO to sustainable cash flow. For the interview, the bridge itself is the answer: it shows you can move from the accounting number to the cash number and name what changes at each step. Held side by side, the two metrics divide cleanly by what they fix and what they are good for.

The Gap Is Wider for Some Property Types

How far AFFO falls below FFO depends almost entirely on how capital-intensive the property type is, which is itself worth knowing. Net lease is the extreme low-capex case: because the tenant pays for maintenance, taxes, and insurance, the landlord spends almost nothing to keep the building earning, so its AFFO sits within a hair of its FFO. Office and hotels are the opposite, carrying heavy tenant-improvement packages, leasing commissions, and building upgrades that swallow a large share of FFO before any cash reaches shareholders.

The reason interviewers care about the distinction is that it determines whether a REIT's dividend is safe, and that is where AFFO earns its keep. A REIT is required to distribute most of its taxable income, so the payout ratio is the metric that signals stress. Measured against FFO, the dividend can look comfortable; measured against AFFO, the same dividend can look dangerously tight, because AFFO reflects the cash actually left after maintaining the portfolio.

Take the bridge above against a $3.40 per-share dividend. The FFO payout ratio is $3.40 divided by $5.70, or 60%, which looks like a well-covered dividend with room to grow. The AFFO payout ratio is $3.40 divided by $3.70, or 92%, which tells a completely different story: nearly every dollar of sustainable cash is going out the door, leaving almost nothing for reinvestment or a downturn. Same REIT, same dividend, two very different read-outs. The candidate who computes both and explains the gap has shown exactly why the distinction is not academic.

This is also why REITs trade on both metrics. Headline valuation multiples are often quoted on FFO for comparability, while AFFO and the AFFO payout ratio drive the dividend-sustainability analysis. How those multiples work in practice is covered in how REITs trade on FFO and AFFO multiples.

A clean spoken answer moves in three beats: FFO fixes net income for depreciation, AFFO fixes FFO for the cash it ignores, and AFFO is the number you trust for dividend safety. Delivered in that order, it shows the logic rather than just the definitions, and it naturally invites the follow-up questions an interviewer wants to ask.

The distinction also connects to the broader logic of why real estate uses its own toolkit at all, from cap rates to NAV rather than EPS and P/E. What lifts your answer above the vocabulary-test version is the through-line: net income is misleading, FFO corrects it, AFFO corrects FFO, and the AFFO payout ratio is where you find out whether the dividend can actually be paid. That arc is the answer the interviewer is grading, and it is the one a candidate who has only memorized the definitions can never quite deliver.