Regulations and interpretations regarding Nonprofit Organizations: http://www.irs.gov/irm/part7/index.html
The IRS homepage for all NPO: www.irs.gov/eo
Form SS-4 – Application for Employer Identification Number: http://www.irs.gov/pub/irs-pdf/fss4.pdf
Form 1023 – Application for Recognition of Exemption Under Section 501(c)(3) of the Internal Revenue Code: ftp://ftp.fedworld.gov/pub/irs-pdf/k1023.pdf
Form 8868 -- Application for Extension of Time to File an Exempt Organization Return, for 12 month extension before a form 1023 must be filed or 90 days for the 990 forms: http://www.irs.gov/pub/irs-pdf/f8868.pdf
Form 990 – Public charity annual form: ftp://ftp.fedworld.gov/pub/irs-pdf/f990.pdf
990 Schedule A: http://www.irs.gov/pub/irs-pdf/f990sa.pdf
990 Schedule B: http://www.irs.gov/pub/irs-tege/eotopich03.pdf
Form 990PF – Private foundation annual form: ftp://ftp.fedworld.gov/pub/irs-pdf/f990pf.pdf
Form 990EZ – Shortened annual form: ftp://ftp.fedworld.gov/pub/irs-pdf/f990ez.pdf
Form 990T – annual form filed in years with Unrelated Business Tax due: http://www.irs.gov/pub/irs-pdf/f990t.pdf
Form 990W – worksheet to determine unrelated business tax: http://www.irs.gov/pub/irs-pdf/f990w.pdf
Form 2848 – Power of Attorney and Declaration of Representative, when the chairperson or president of the board cannot sign for some reason, another officer can stand in for him or her: http://www.irs.gov/pub/irs-pdf/f2848.pdf
Form 941 – Employer’s Quarterly Federal Tax Return: http://www.irs.gov/pub/irs-pdf/f941.pdf
Form 8821 – Tax Information Authorization allows the IRS to provide information about your application to an employee other than a principal officer or director: http://www.irs.gov/pub/irs-pdf/f8821.pdf
Form 8283 – For noncash donations over $5,000: http://www.irs.gov/pub/irs-pdf/f8283.pdf