Is the capital account on my K-1 the same as my basis?

No. Item L of the K-1 shows your tax-basis capital account, which excludes your share of partnership liabilities. Your outside basis is generally the capital account plus your share of liabilities reported in item K. Using the capital account alone understates basis for most partners in practices or real estate ventures that carry debt.

What happens if my K-1 loss is bigger than my basis?

The excess loss is suspended. Section 704(d) limits your deductible loss to your outside basis; anything above it carries forward until basis is restored by income allocations, contributions, or increased debt share. The loss is not gone, but it is not helping you this year either.

Does partnership debt really increase my basis?

Yes. A partner's share of partnership liabilities is treated as a deemed cash contribution, which increases outside basis. The reverse is also true: when the partnership pays down debt or your share of it shifts, your basis drops, which can quietly make a distribution taxable or a loss nondeductible.

What is the order of limitations on partnership losses?

Four gates, in sequence: basis under section 704(d), at-risk under section 465, passive activity under section 469, and the excess business loss limitation under section 461(l). A loss must pass all four to land on your return. Each gate has its own carryforward, which is why loss tracking gets messy without a schedule.

Does a practice buy-in give me basis?

Yes. Whether you contribute cash, sign a note, or buy the interest from a retiring partner, your payment creates outside basis, and if the practice carries debt you generally add your share of that too. This is why a buy-in financed with a personal loan still produces real basis even though your cash came from a bank.

Who is responsible for tracking my basis, me or the partnership?

You are. The partnership reports its books, including your capital account, but outside basis is the partner's own attribute and the IRS expects the partner to maintain the schedule. Good firms provide basis schedules; many do not. If no one has one for you, that is a project worth doing before the next big loss or distribution, not after.

Partnership Q&A

Partnership Tax Basis

One running number decides whether your losses deduct, your distributions stay tax-free, and what you owe when you exit. Most partners have never seen theirs.

A guide by Taxstra Tax & Accounting · CPA-led tax strategy for business owners

Your Guide

01What Basis Is and What It Controls 02The Calculation, Step by Step 03Capital Account vs Basis 04A Worked Buy-In Example 05Frequently Asked Questions

K-1 & Partnership Taxes>Partnership Tax Basis

Written by Bryan Martin, CPA, Managing Partner and Founder of Taxstra. Last updated August 20, 2026.

Quick answer

Your partnership basis, called outside basis, starts with what you contributed plus your share of partnership debt, then moves each year: up for allocated income and contributions, down for distributions and losses. It caps deductible losses under section 704(d) and makes distributions taxable once they exceed it.

Basis is the least glamorous number in partnership tax and the one that settles every important question: whether this year's loss deducts, whether that distribution was really tax-free, and how much gain you recognize when you sell or retire.

This page covers outside basis in a partnership specifically. For the concept of basis generally, across stocks, homes, and entities, start with What Is Basis? For the strategy of managing basis across your entities year to year, see owner basis management.

What Basis Is and What It Controls

Your after-tax investment, kept as a running total.

Outside basis is your tax investment in the partnership interest itself. Think of it as a ledger of money that has already been taxed or contributed: what you put in, plus income you were taxed on but left in the business, plus your share of the partnership's debt, minus what you took out and the losses you deducted.

Loss gateLosses deduct only up to basis; the rest suspends and carries forward

Distribution ceilingCash out stays tax-free only while basis stays above zero

Exit meterSale proceeds minus basis is your gain when you leave

Basis is the first of four gates

Passing the basis test does not guarantee a loss deducts. The loss still has to clear the at-risk rules, the passive activity rules, and the excess business loss limitation. But basis is the gate partners most often fail without knowing it, because nobody was keeping the schedule.

The Calculation, Step by Step

The annual ordering matters.

Each year, in this order

Start with last year's ending basis
Add contributions and any increase in your share of partnership liabilities
Add your allocated income items, including tax-exempt income
Subtract distributions and any decrease in your liability share
Subtract nondeductible expenses, then allocated losses, only to the extent basis remains

The ordering is taxpayer-friendly in one direction: income allocations restore basis before distributions are tested against it, which is why a normal year of profits plus draws does not generate gain. The trap runs the other way: debt paydowns reduce basis silently, and a year that combines a loss allocation with a debt reduction can suspend losses you assumed were usable.

Watch Out

Losing basis without writing a check

Your share of partnership debt is part of your basis. When the practice pays off its equipment loan, or a refinance shifts debt among partners, basis falls with no cash event you would notice. Partners with thin basis and amortizing practice debt should look at the schedule every year, not just in loss years.

Capital Account vs Basis

Item L is not your number.

Since partnerships began reporting tax-basis capital accounts, many partners assume item L of the K-1 is their basis. It is close in concept but wrong in one big way: the capital account excludes your share of partnership liabilities, which item K reports separately. For partners in leveraged practices or real estate ventures, the difference can be enormous, and it always runs in the direction of understating what you can deduct.

Taxstra CPA Tip

Quick sanity check you can do with this year's K-1: take item L ending capital, add your item K liability share, and compare the result to any basis number your preparer is using. If the numbers are far apart and nobody can explain why, the schedule needs rebuilding, ideally from the year you joined.

A Worked Buy-In Example

Where a new partner's basis actually comes from.

Illustrative round numbers. Dr. Chen buys into a surgical group for $150,000, financed with a personal bank loan, and is admitted to a 10% interest. The practice carries $2,000,000 of equipment and working-capital debt.

Year one basis

Buy-in payment (personal loan proceeds count)$150,000
10% share of practice liabilities$200,000
Allocated income, year one$300,000
Distributions received($260,000)
Ending outside basis$390,000

Three things worth seeing in the numbers. The bank loan did not reduce her basis; where the cash came from is her business, not the partnership's. The $260,000 of distributions were tax-free because allocations and debt share kept basis well above zero. And her capital account will show roughly $190,000, not $390,000, because it ignores the debt share, which is exactly the item L trap from the previous section. How the buy-in itself is structured, and whether the practice makes a Section 754 election, is covered in our practice buy-in guide.

Nobody Has a Basis Schedule for You?

Reconstructing basis after years of K-1s is exactly the kind of cleanup that prevents a nasty surprise at a refinance, a big loss year, or your exit. A Taxstra CPA can build the schedule. The initial consultation is free.

Frequently Asked Questions

Start with cash and the basis of property you contributed, plus your share of partnership liabilities. Each year, add your allocated income and additional contributions, then subtract distributions and allocated losses, in that order. The running total is your outside basis, and it can never go below zero.

Know Your Number Before You Need It

Basis questions always surface at the worst time: a sale, an audit, a loss you were counting on. Book a free initial consultation with a Taxstra CPA and get the schedule built now.

Next Steps

Filing it yourself is fine. Optimizing it is where the money is.

Getting the form right keeps you out of trouble. The strategies below are what actually lower the bill.

Want a CPA to run the numbers for you?

Free 30-minute call with a Taxstra CPA. No pressure, just the math for your situation.

Authoritative Sources

Citations reflect U.S. federal tax law as of the article's last reviewed date.

Related Partnership Guides

Physician K-1 & Partnership Taxes

The hub guide for physicians earning partnership income.

Are Partnership Distributions Taxable?

The basis ceiling in action on cash coming out.

What Is Basis?

The general concept across stocks, real estate, and entities.

Selling a Practice: The Tax Side

Where your basis number finally settles the score.