S-Corp Shareholder Basis Tracking: Why It Matters and How to Do It

S-Corp basis fundamentals:

Stock basis starts at:

• Cash contributed to the corporation at formation
• Fair market value of property contributed (with adjustments)
• Purchase price of stock acquired from another shareholder

Stock basis increases for:

• Additional capital contributions
• Separately stated income items (ordinary income, capital gains, tax-exempt income)
• Non-separately stated income (ordinary business income from the K-1)

Stock basis decreases for (in this order):

1. Distributions (non-dividend distributions reduce basis, but NOT below zero)
2. Non-deductible expenses (fines, penalties, 50% of meals pre-2018)
3. Non-separately stated loss or deduction
4. Separately stated loss or deduction items

The ordering matters. Distributions reduce basis BEFORE losses. This means a large distribution in a loss year can push the shareholder’s basis below zero for distribution purposes (triggering capital gains) while also preventing the loss from being deductible.

Debt basis (separate from stock basis):

• Only DIRECT loans from the shareholder to the corporation create debt basis
• Guarantees of corporate debt do NOT create basis (this is the most common mistake)
• Bank loans to the corporation, even if personally guaranteed by the shareholder, do NOT create debt basis
• Third-party loans do NOT create basis
• Debt basis allows deduction of losses only AFTER stock basis is exhausted

What happens when basis is exceeded:

Distributions exceeding stock basis:

• The excess is taxable as a capital gain (long-term if stock held >1 year)
• Example: stock basis is $10,000. Shareholder receives $25,000 distribution. $10,000 reduces basis to zero (non-taxable). $15,000 is taxable as capital gain.

Losses exceeding stock + debt basis:

• The excess is suspended (carried forward indefinitely)
• The suspended loss is deductible in a future year when basis is restored (through income or additional contributions)
• Example: stock basis is $5,000, debt basis is $3,000. K-1 shows a $20,000 loss. $8,000 is deductible (reducing stock and debt basis to zero). $12,000 is suspended.