Resource.org has gathered reports dating back to 2002 and says that they process new data monthly. Bulk data can be pulled from here.
For those who prefer a simple search, the Economic Research Institute (ERI) has a database of forms dating back to 2003.
In at least one case, a journalist on the NICAR-L list reported back that there was a form in the ERI ...
There's also a good list just released from ProPublica starting for 2012 http://projects.propublica.org/nonprofits/
And you can always request a 990 directly from an entity -- it is required to give it to you.
Also, GuideStar aggregates them and allows you to obtain one-at-a-time at no cost. Aggregate data will cost, however.
It's difficult to know when to use the Stack Exchange "answer" field for an inconclusive answer, but after a review of the IRS's website, I don't see much sign of this, particularly for the 1f code on that form, but really, for anything. The most prominent source of structured data from the IRS that I found is the Tax Stats section, which isn't what you're ...
Been slightly inattentive here, but for posterity's sake, I wanted to post the results of my cleaning effort: machine-readable SOI data.
Like most intensive data cleaning I've been a part of, it wasn't the result of a single programming effort. For example, a fair bit of consideration went in to how to reconcile the individual annual series. The coverage....
Citizen Audit is a good alternative to guide star.
The search process is less click hungry.
Getting several fiscal years at a time is possible on a unique page.
More fiscal years available for IRS 990. ( generally go until 2005/2006, where guidestar give, in most case, the last 3 years.
API and bulk access are a possibility ( if ...
I emailed the people at the IRS SOI. Here is their response:
The reason returns that have no AGI but show a high average tax amount is due almost entirely to the Alternative Minimum Tax. Returns with no AGI will not have income tax without a special income tax calculation, such as the AMT.
This unfortunately means that the AGI as listed does not have ...
According to @MichaelA (in the comments), zip code level IRS income machine-readable income data is not available for every year, and the IRS has no plans to do so/isn't very receptive to the idea
You can get all the data based on county/city (not zip) for the years 1989-2010 here:
So not the exact ...
using scraperwiki, i can parse the .xls just fine. place the url in the input field, after it is done uploading, select download as spreadsheet, and you'll get .csv/.xlsx.
not an answer to the question(s) you posed directly, but an answer nonetheless. hope its useful...