How to determine basis in inherited real estate property for capital gains tax?

What about using the property tax records from the county? Would those be considered reliable evidence for the IRS? And can someone really get a retroactive appraisal after 10 years? How accurate would that even be?

Property tax records from the county can definitely be used as supporting evidence, though they're often below actual market value. The IRS understands that establishing basis for inherited property can be challenging, so they allow reasonable methods when direct evidence isn't available. Retrospective appraisals are actually quite common in this situation. Professional appraisers have methods to research historical data to determine what a property would have been worth at a specific past date. While not as precise as a contemporaneous appraisal, they're generally accepted by the IRS when done by a qualified professional with proper documentation of their methodology.

How exactly does this work? Does it just pull public records or do they have some kind of special database for historical property values? I'm dealing with something similar but the property is in a really rural area.

I'm pretty skeptical about these online tax tools. How can they possibly know local real estate trends from 10 years ago better than somebody who actually lives there? And did this actually hold up if you got audited?

The tool pulls from multiple data sources including public records, but they also have access to historical real estate databases that include rural areas. They look at actual sales data from the time period in question and can establish patterns even in less populated regions. They use a combination of historical data analysis and applicable tax law to create documentation that meets IRS standards. In my case, I wasn't audited, but they provided a complete audit defense file with all the supporting documentation, methodology explanations, and relevant tax code references that justified the approach. Their documentation is specifically designed to hold up under IRS scrutiny.

Wait, you can actually get through to a real IRS person? How does this work? I've literally spent hours on hold only to get disconnected.

This sounds too good to be true. The IRS phone system is basically designed to be impenetrable. I doubt any service can actually guarantee getting through. And even if you do, what are the chances you get someone who knows what they're talking about?

Yes, you actually get through to a real IRS agent! The service basically navigates the IRS phone system for you and calls you back once they have an agent on the line. It saves all those hours of hold time and frustration. The key is knowing what department and what question type to select in their system, which Claimyr has figured out. I was skeptical too, but when they connected me, I had a 25-minute conversation with an IRS specialist who dealt specifically with basis issues. They were knowledgeable about the exact publication sections I needed. You still need to be prepared with your specific questions when they call you back, but actually getting a human on the line makes all the difference.

How did you adjust for the fact that assessed values are usually way below market? Did you use some kind of multiplier or formula?

We actually worked with the real estate agent to determine the typical ratio between assessed value and actual sales prices in that specific neighborhood during that time period. In our case, properties were selling for approximately 2.3 times their assessed value in that area and year. We documented this methodology, included comparable sales data from the same neighborhood within 6 months of the inheritance date, and created a clear paper trail showing how we arrived at our basis figure. We also attached a letter explaining the unavailability of direct documentation from the time of inheritance and why our method represented a reasonable good faith attempt to determine fair market value.

This is a great point. I'm in Florida and our property assessed values can also be wildly off from actual market value. If your client is in a state with similar property tax limitations, what approach did you end up using instead?

This is incredibly helpful! I'm new to dealing with inherited property basis issues and this breakdown is exactly what I needed. Quick question about the Zillow estimates - do you typically print screenshots from the date of inheritance, or do they actually have historical data that shows what their estimate was back then? I'm worried about using current estimates that might be trying to "guess" what the value was 10 years ago versus actual historical records from that time. Also, regarding the extension filing - is there a specific form or process for requesting additional time when you're gathering basis documentation, or do you just file a regular extension and explain the situation?

Great questions! For Zillow estimates, you'll want to use their actual historical data rather than current estimates. If you go to a property's Zillow page and scroll down to the "Price History" section, they often show their Zestimate values going back several years. You can screenshot these historical estimates from around the inheritance date. This is much stronger evidence than trying to extrapolate backwards from current values. For extensions, you'd just file Form 4868 (automatic extension) or Form 2350 (if you need more than 6 months) like normal. In your records, document that you're using the extra time to gather proper basis documentation, but you don't need to explain this to the IRS in the extension request itself. The key is having your methodology and supporting documents ready when you do file. One additional tip - if you're in an area with an active MLS system, sometimes local realtors can access "sold" data going back 10+ years that might not show up in public records searches. This can be gold for establishing comparable sales around the inheritance date.

Great questions! For Zillow historical data, you want to use their actual historical estimates if available. If you go to a property page and scroll down to the price history section, it sometimes shows their Zestimate from previous years. However, if that's not available, you can document that you're using current tools to estimate historical value - just be transparent about your methodology. For extensions, you'd file Form 4868 (individual) or 7004 (business) like any regular extension. You don't need to specify the reason on the extension form itself, but I always recommend keeping detailed notes in your client file about why additional time was needed for basis documentation. The IRS doesn't require you to explain the basis issue when requesting the extension. One more tip - if you're still struggling with documentation, consider reaching out to local real estate professionals who were active in that market 10 years ago. They often have institutional knowledge about property values and market conditions that can support your basis calculation.

Great questions! For Zillow estimates, you want to look for their actual historical data if available. Zillow does keep some historical estimates, but they're not always reliable or available going back 10 years. What I typically do is use multiple online sources (Zillow, Realtor.com, etc.) and see if any have historical snapshots from around the inheritance date. Sometimes you can find cached versions using the Internet Archive's Wayback Machine. However, I'd honestly recommend focusing more on the real estate agent CMA approach that @Anthony mentioned - that tends to carry more weight with the IRS since it's based on actual comparable sales rather than algorithmic estimates. For the extension, you'd just file Form 4868 (automatic extension) which gives you until October 15th. You don't need to specify the reason - the extension is automatic. Just make sure to pay any estimated tax owed to avoid penalties. The extra time lets you properly document your basis calculation rather than rushing into a potentially costly mistake. One more tip: if you do end up using assessed values, document the local assessment practices. Some counties assess at 100% of market value, others at fixed percentages. Knowing this helps justify your adjustment methodology.

Great questions! For Zillow estimates, you want the actual historical data from that time period, not current retroactive estimates. Zillow does keep historical records - you can access their "Price History" section which shows their actual estimates from previous dates. Screenshots from around the inheritance date are what you want, not current estimates trying to guess backwards. For extensions, you'd file the standard Form 4868 (individual) or 7004 (if dealing with estate/trust issues). You don't need to specify the basis documentation issue on the extension form itself - that's handled when you actually file the return with your documentation and explanation. One more tip: if you're using the county assessment approach, make sure to research what percentage of market value your specific county typically assesses at. Many counties assess at 80-90% of market value, and this ratio can vary significantly by location and property type. Document this research as part of your methodology.

Great questions! For Zillow estimates, you want the actual historical data from that time period, not current retroactive estimates. Zillow's "Price History" section shows their actual Zestimate from specific dates going back years - look for the little dots on their price graph that you can hover over to see the estimate from the inheritance date. Screenshot that specific historical estimate, not a current one. For extensions, you'd file Form 4868 (individual) or 7004 (business) like normal. You don't need a special process for basis documentation issues - the extension gives you time to gather whatever supporting materials you need. Just make sure you still pay any estimated tax owed to avoid penalties. One more tip: if you're in a state with disclosure laws, check if the property had any sales within a few years before/after the inheritance date. Those actual sale prices can help validate whatever basis method you choose.

Great questions! For Zillow historical data, they do keep some historical estimates, but the availability varies. You want to look for their "Price History" section which sometimes shows their Zestimate from past dates. However, be aware that their historical data isn't always complete going back 10 years. When I use online estimates, I typically combine them with other sources rather than relying on them alone. For extensions, you'd file the regular Form 4868 for individual returns. You don't need to specify the reason on the form itself, but I always keep detailed notes in the client file documenting why additional time was needed to properly establish basis. The IRS doesn't require you to explain the extension request, but having that documentation helps if questions arise later. One tip: if you're gathering multiple sources of evidence, create a simple spreadsheet showing all your valuation methods and their results. This helps demonstrate that you used a reasonable approach and weren't just picking the most favorable number.

Great questions! For Zillow estimates, you want to look for their actual historical data if available. Zillow does maintain some historical estimates, but the further back you go, the less reliable they become. I typically use their "Price History" section which sometimes shows their estimates from previous years. However, you're right to be cautious - current estimates trying to backdate aren't as strong as contemporaneous records. For extensions, you'd file Form 4868 for individual returns (or 7004 for business) just like any other extension. You don't need to specify the reason on the form itself, but I always document in my files why additional time was needed. The key is that you still need to pay any estimated tax owed by the original due date to avoid penalties. One additional tip: if you're in a state with disclosure requirements for real estate sales, the state real estate commission sometimes maintains databases of historical sales that can be invaluable for establishing comparable values from the inheritance date.

Great questions! Regarding Zillow estimates - you want to use their actual historical data when possible. Zillow's "Price History" section often shows their estimates from specific past dates, not retrospective guesses. Look for the graph view that shows their Zestimate timeline. However, you're right to be cautious - if you can only find current estimates that claim to show historical values, document that limitation. For extensions, you'd file Form 4868 for automatic extension (or Form 7004 if dealing with business/trust returns). You don't need to specify the reason on the extension form itself, but I always document in my files why additional time was needed for basis research. The key is showing good faith effort to determine the correct tax liability. One more tip: if you find multiple valuation methods give you different results, using the average or a conservative middle-ground approach often works well. The IRS appreciates reasonable judgment when perfect data isn't available.