Section 180: How Much Can I Save?
Short answer: Your first-year saving is roughly the documented fertilizer value times your combined marginal tax rate. If you sell while any of that fertility remains, the part of the price attributable to it is taxed as ordinary income. And all of it comes back — with interest and possibly a penalty — if the deduction doesn’t hold up.
The formula
“Documented value per acre” means the value of unexhausted fertilizer you can tie to the seller’s applications — not the value of every nutrient in the soil — capped at its proportional share of the price you paid. “Combined marginal rate” is the federal, state and (for most farmers) self-employment tax you’d pay on the next dollar of Schedule F income. Your preparer can give you yours.
Estimate it
Enter acres and a documented value per acre to see an estimate. We don’t assume a typical value, because most parcels have far less defensible residual fertilizer than marketing suggests.
If you sell while any of this fertility remains in the soil, the part of the price attributable to it is taxed as ordinary income.
An illustration based on your inputs, not a quote or a prediction. See “How settled is this?” below.
Worked example: the same farm, two approaches
Assumptions (illustrative): 160 acres of Illinois cropland bought for $12,000 per acre ($1,920,000). Comparable land without the extra fertility sells for $11,900 per acre. The seller kept P and K well above university critical levels and provided five years of application records. Combined marginal rate: 35%.
| Documented-fertilizer approach | Total-nutrient approach | |
|---|---|---|
| Basis of the value | P, K and lime above critical level, traced to seller’s records, valued at purchase-month prices | All measured nutrients above a regional “baseline,” including micronutrients and organic matter |
| Agronomic value per acre | $180 | $1,500 |
| After the price-allocation limit | $178.81 (180 ÷ 12,080 of $12,000) | $1,343.28 (1,500 ÷ 13,400 of $12,000) |
| Deduction (160 acres) | $28,609 | $214,925 |
| Year-one tax saving at 35% | $10,013 | $75,224 |
| If sold while that fertility remains | The part of the price attributable to it is ordinary income | Same |
| If held until death | Basis generally steps up; no recapture | Same |
| If disallowed on audit | Repay $10,013 + interest; penalty less likely if the TAM conditions were met | Repay $75,224 + interest + 20% accuracy penalty ($15,045), up to 40% for a gross valuation misstatement |
| Where it stands | Follows the only IRS guidance | Iowa State CALT finds no legal support (source) |
The $180 and $1,500 figures are hypothetical, chosen to show the gap between the two methods. Your value depends on your parcel’s records and soil tests. Results in marketing materials — including ours — are not typical and not a promise. The price-allocation limit and the ordinary-income treatment on resale both come from the University of Illinois Tax School; if the fertility is drawn down before you sell, the lower land basis shows up as capital gain instead.
Quick sensitivity table
Year-one saving per acre for every $100 per acre of documented value:
| Combined marginal rate | Saving per acre |
|---|---|
| 25% | $25 |
| 35% | $35 |
| 45% | $45 |
Things that change the math
- Self-employment tax. A Schedule F deduction usually cuts SE tax too, which raises the real saving for most owner-operators.
- Losses. A large deduction can create a farm loss. Farming losses have special carryback rules, but the excess business loss limit can also defer part of it [Attorney: confirm current §172(b)(1)(B) and §461(l) treatment].
- Qualified business income deduction. Lower farm income can reduce your QBI deduction, trimming the net benefit.
- Seller’s side. If the seller reports the fertilizer slice as ordinary income, they may ask for a higher price or refuse the allocation. See Seller tax consequences.
- Fees. Subtract the cost of sampling and valuation.
Next:What the IRS requires, Audit risk and penalties, Buyer timeline
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