5 Common Mistakes That Get Charitable Deductions Disallowed

One missing signature or late appraisal can cost you thousands. Here's how to keep the IRS from rejecting your noncash donation deduction.

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In Friedberg v. Commissioner, the Tax Court disallowed a couple's $3.775 million charitable deduction for a donated facade easement — not because the donation wasn't real, but because of procedural failures in the appraisal and documentation. In Alli v. Commissioner, a noncash deduction for a donated building was thrown out because the taxpayer failed to obtain a qualified appraisal. Case after case tells the same story: the IRS doesn't just look at whether you donated — it looks at whether you followed the rules to the letter.

Noncash charitable contributions over $5,000 face intense IRS scrutiny. The agency employs Art Advisory Panels, reviews Form 8283 filings in bulk, and applies strict statutory requirements that can void your deduction entirely — even when the underlying donation is legitimate.

Here are the five most common charitable deduction mistakes we see, and exactly how to avoid them.

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Table of Contents#

1. Mistake 1: Getting the Appraisal Too Late
2. Mistake 2: Using an Unqualified Appraiser
3. Mistake 3: Inflating Fair Market Value
4. Mistake 4: Incomplete or Incorrect Form 8283
5. Mistake 5: Failing to Get a Contemporaneous Written Acknowledgment
6. How to Protect Yourself
7. How Technology Reduces Errors

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Mistake 1: Getting the Appraisal Too Late#

The Rule#

For noncash charitable contributions exceeding $5,000, the IRS requires a qualified appraisal under IRC §170(f)(11). That appraisal must be conducted no earlier than 60 days before the donation and no later than the due date (including extensions) of the return on which you first claim the deduction.

Miss that window, and your deduction can be disallowed entirely.

Why It Happens#

Most donors think about appraisals as a tax-filing task — something to handle in March or April. But if you donated property in June and don't get the appraisal until 14 months later when your accountant reminds you, you may have already missed the window if you filed on time.

Others get confused about the "60 days before" rule. The appraisal cannot be performed more than 60 days before the date of contribution. If you had property appraised in January but didn't donate until May, that appraisal is too early.

What the IRS Does#

The Tax Court has repeatedly upheld disallowance when appraisals fall outside the timing window. Courts have consistently disallowed deductions where the taxpayer's appraisal did not meet the regulatory timing requirements. The IRS treats this as a bright-line rule — there's virtually no "reasonable cause" exception for timing failures on qualified appraisals of high-value donations.

How to Avoid It#

• Schedule your appraisal within the 60-day window before your planned donation date
• If donating at year-end, get the appraisal in November or December — not the following spring
• Calendar the deadline: your appraisal must be complete before you file the return claiming the deduction

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Mistake 2: Using an Unqualified Appraiser#

The Rule#

Under IRC §170(f)(11)(E)(ii) and Treasury Regulation §1.170A-17(b), a qualified appraiser must meet all of the following:

1. Earned a recognized appraisal designation from a professional organization (e.g., ASA, AAA, or RICS) or met minimum education and experience requirements
2. Regularly performs appraisals for which they receive compensation
3. Demonstrates verifiable education and experience in valuing the type of property being appraised
4. Has not been barred from presenting evidence before the IRS under 31 U.S.C. §330(c)
5. Is not the donor, donee, or a party to the transaction

Why It Happens#

Donors frequently use a friend who's a real estate agent, a business partner with "valuation experience," or an online service that produces templated reports without a credentialed appraiser behind them. They assume that any professional opinion of value satisfies the IRS.

It doesn't.

What the IRS Does#

In Alli v. Commissioner (T.C. Memo 2014-15), the Tax Court disallowed a charitable deduction for a donated building because the appraisal was not conducted by a qualified appraiser as defined by the regulations. The court found the appraiser lacked the required designation and experience in valuing the specific type of property donated.

The IRS also scrutinizes whether the appraiser has specific experience valuing the type of property at issue. A qualified real estate appraiser is not automatically qualified to appraise a donated art collection, vehicle fleet, or patent portfolio.

How to Avoid It#

• Verify credentials — check for ASA, AAA, or equivalent designations
• Ask about experience with your specific property type
• Confirm they're not on the IRS exclusion list under 31 U.S.C. §330(c)
• Read our guide: How to Choose a Qualified Personal Property Appraiser

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Mistake 3: Inflating Fair Market Value#

The Rule#

IRC §6662(e) and (h) impose accuracy-related penalties when taxpayers overstate the value of donated property:

Overstatement Level	Penalty
150% or more of correct value (substantial misstatement)	20% of the underpayment attributable to the overstatement
200% or more of correct value (gross misstatement)	40% of the underpayment attributable to the overstatement

For charitable deduction property, the reasonable cause defense under IRC §6664(c)(3) is not available for either substantial (150%+) or gross (200%+) valuation overstatements. That means both the 20% and 40% penalties are essentially automatic when the overstatement thresholds are met.

Why It Happens#

Donors naturally want the highest defensible value — and some appraisers are willing to oblige. "Friendly" appraisals that cherry-pick comparable sales, ignore condition issues, or use aggressive methodologies create valuations the IRS can easily challenge.

The problem is compounded with hard-to-value property like art, collectibles, closely held stock, and real estate with unusual features. There's genuine ambiguity in many valuations — but the IRS draws sharp penalty lines regardless.

What the IRS Does#

The IRS Art Advisory Panel reviews noncash donation appraisals for artwork valued at $50,000 or more. According to IRS data, the panel adjusts values in a significant percentage of cases reviewed — frequently downward. For non-art property, IRS examiners compare claimed values against their own research using market data, comparable sales, and internal valuation tools.

In numerous Tax Court cases, courts have reduced the claimed value of donated property and applied the gross valuation misstatement penalty where the taxpayer's appraised value was found to be more than 200% of the court-determined fair market value.

How to Avoid It#

• Use conservative, well-documented comparable sales — not aspirational values
• Disclose limitations in condition, marketability, and restrictions
• Get a second opinion if the value seems aggressive
• Understand the OBBBA changes — see How the OBBBA Changes Your Tax Deduction in 2026

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Mistake 4: Incomplete or Incorrect Form 8283#

The Rule#

Noncash charitable contributions require Form 8283 (Noncash Charitable Contributions):

• Section A — for items (or groups of similar items) valued between $500 and $5,000
• Section B — for items (or groups) valued over $5,000 (requires a qualified appraisal and appraiser's signature)

Section B is where most errors occur. It requires:

• A complete description of the donated property
• The appraised fair market value
• The appraiser's declaration (Part IV) — signed and dated
• The donee acknowledgment (Part V) — signed by the receiving charity
• The method of valuation and specific comparable sales data

Why It Happens#

Form 8283 requires coordination between three parties: the donor, the appraiser, and the donee organization. Missing any one signature can invalidate the form. Common errors include:

• Leaving Section B blank and only completing Section A for property over $5,000
• Missing the appraiser's signature in Part IV
• Missing the donee's signature in Part V
• Vague property descriptions ("miscellaneous household items" instead of specific, itemized descriptions)
• Not attaching the full appraisal when required

What the IRS Does#

The IRS has disallowed deductions in numerous cases for Form 8283 deficiencies. In Mohamed v. Commissioner, the Tax Court denied a deduction because the taxpayer failed to obtain the donee's signature on Form 8283, Section B. Courts have generally held that substantial compliance with Form 8283 requirements may suffice — but only if the failure was due to reasonable cause, not neglect.

However, don't rely on the substantial compliance doctrine. The IRS contests it regularly, and courts are inconsistent in how they apply it.

How to Avoid It#

• Use a checklist when completing Form 8283 — ensure every section, signature, and attachment is present
• Get the donee's signature before filing — charities are sometimes slow to respond
• Provide specific property descriptions — include quantity, condition, and identifying characteristics
• Attach the full qualified appraisal to your return for donations over $5,000
• Read our complete guide: IRS Form 8283: The Complete Guide

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Mistake 5: Failing to Get a Contemporaneous Written Acknowledgment#

The Rule#

Under IRC §170(f)(8), no deduction is allowed for any single charitable contribution of $250 or more unless the taxpayer obtains a contemporaneous written acknowledgment (CWA) from the donee organization. The CWA must include:

1. The amount of cash and a description of any noncash property contributed
2. Whether the organization provided any goods or services in return
3. A good-faith estimate of the value of any goods or services provided (or a statement that the benefits were exclusively religious/intangible)

"Contemporaneous" means the donor must obtain the CWA no later than the earlier of:

• The date the donor files the return for the year of the contribution, or
• The due date (including extensions) for filing that return

Why It Happens#

Many donors assume their canceled check, credit card statement, or email confirmation is sufficient. It's not — the statute specifically requires a written acknowledgment from the charity that includes the three elements above.

Others receive a generic thank-you letter that says "Thank you for your generous donation" without specifying the amount, describing the property, or addressing whether goods/services were provided. That letter doesn't qualify as a CWA.

What the IRS Does#

The Tax Court has been ruthlessly strict on CWA requirements. In Durden v. Commissioner (T.C. Memo 2012-140), the court disallowed a couple's $25,171 charitable deduction because they failed to obtain contemporaneous written acknowledgments — even though they had canceled checks and other records proving the donations occurred.

In Villareale v. Commissioner, the court denied deductions where the acknowledgment letter didn't include the required statement about goods or services. The CWA requirement is treated as a strict statutory condition — not merely an evidentiary preference.

How to Avoid It#

• Request the CWA from the charity immediately after donating — don't wait until tax season
• Verify it contains all three required elements before filing
• Keep the original in your tax records
• For noncash donations, ensure the CWA describes the property (not just "a generous donation")

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How to Protect Yourself#

Here's your pre-filing checklist for any noncash charitable contribution over $5,000:

• ✅ Appraisal timing — conducted no earlier than 60 days before donation, no later than filing deadline
• ✅ Qualified appraiser — holds recognized designation (ASA, AAA, etc.), experienced in your property type
• ✅ Defensible valuation — based on documented comparable sales, conservative methodology
• ✅ Form 8283 complete — Section B filled out, appraiser signed Part IV, donee signed Part V
• ✅ CWA obtained — from the charity, with all three required elements, before you file
• ✅ Full appraisal attached — to the return, meeting all regulatory requirements
• ✅ Records retained — appraisal, CWA, Form 8283, photos, correspondence — keep everything for at least 7 years

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How Technology Reduces Errors#

Many charitable deduction mistakes stem from a single root cause: unreliable valuations. When the appraised value is based on thin data, cherry-picked comparables, or subjective judgment calls, the entire deduction becomes vulnerable.

This is where technology is changing the game.

AI-powered valuation tools like AIpraisal analyze thousands of comparable sales in seconds, providing data-backed fair market value estimates that stand up to scrutiny. Instead of relying on one appraiser's opinion of which three comps to use, you get a comprehensive market analysis that:

• Identifies the most relevant comparable sales from extensive databases
• Accounts for condition, location, and market trends systematically
• Produces defensible, transparent valuations that align with IRS expectations
• Reduces the risk of overvaluation penalties by grounding values in real market data

A qualified appraiser still needs to sign off on the final value — but starting with accurate, technology-driven comps means the appraisal is built on a solid foundation rather than guesswork.

The result? Fewer charitable contribution audit surprises, fewer IRS disallowed deductions, and more confidence that your noncash donation deduction will hold up.

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Don't Let a Paperwork Mistake Cost You Thousands#

The IRS disallows legitimate charitable deductions every year — not because the donations were fraudulent, but because donors didn't follow the rules. Every mistake on this list is preventable.

If you're planning a noncash charitable contribution, start with accurate data. Explore how AIpraisal can help you build a defensible valuation →