Amortization calculator - Also a mortgage calculator that lets you keep recalculating based on a higher down-payment or added amounts to monthly payments.

Bonus calculator - aggregate method. Uses regular federal withholding rates. Use if your state allows the aggregate method. Free registration required.

Bonus calculator - percent method. Uses supplemental withholding rates. Use if your state does not have a supplemental withholding rate and permits the percent method. Free registration required.

Calendar calculator - generate a calendar for any month.

Car lease payment calculator - lays out the future costs of an auto lease.

CD calculator - shows payout at maturity based on initial deposit, interest, term and period of compounding (daily, weekly, monthly, etc.).

Currency converter - converts any currency into any other.

Currency converter - converts any currency into any other.

Financial Calculators - Any financial calculator you need.

Gross-up calculator - when you want an employee's bonus to include payment of the taxes the employee would have had to pay on the bonus. Free registration required.

Hourly employee paycheck calculator - includes filing status, deductions, state withholding, exemptions, other withholding etc. Free registration required.

Loan calculator - calculates loan payment amounts; savings and annuity amounts and future value.

Mathematical functions - from basic to PhD level.

Measurement converter - converts any measure to any other.

Monthly compounding calculator - takes an amount and compounds it monthly over a fixed period at a fixed annual yield. Allows added monthly contributions.

Monthly mortgage payment table calculator - generates a table of monthly payments.

Number of days calculator - calculate the number of days between any two dates.

Public employee paycheck calculator - for federal, state, and local governments. Free registration required.

Roth IRA - conversion calculator.

Time zones - zone-by-zone times worldwide.

Tip tax calculator - if your employees receive tips. Free registration required.

Client help (help for small firms)

Business expenses - how to reduce expenses; a checklist.

Business plans - useful for new or growing businesses. Be sure to click on “Writing the plan” and “Using the plan” in the lefthand column.

Business records retention - to see how long to keep different kinds of business records.

Business scams - current ones, how to guard against.

Business start-ups - checklists for new businesses.

Business start-ups - selecting the right entity (sole proprietorship, S corp, LLC, etc.).

Business structure - comparisons (sole proprietorship v. S corp v. LLC, etc.).

Credit and Collections - the federal Fair Debt Collection Practices Act, section by section.

Domain names - find out what names are available before you try to register a name.

Fax worldwide via e-mail - free trial on faxing from any place in the world to any place in the world.

Home-business scams - current ones, how to guard against.

Management - free library comprises 72 categories including finance, benefits administration and compensation.

Social Security Statement - request a personal statement online.

Strategic Planning Process - basics.

Taxpayer Advocate Service.

Trade magazines by industry - free.

Wages - by geographical area and occupation.

Legal forms - contracts, loan documents, and other forms by state.

Daily cash sheet template - plug in daily amounts and spot discrepancies (from theft, misrecorded credit-card purchases, etc.)

Dictionaries and Glossaries

Abbreviations - used in business

Abbreviations - used on the Internet (in e-mail, chatrooms, etc.)

Accounting terms - dictionary.

Area codes - quickly find  the area code for a geographical location—or find the geographical location of the area code that you are dialing.

Banking terms - for paper, EFT, AMT and other transactions.

Business tax, financial, and real-estate terms - a glossary.

Nonprofit organization (NPO) accounting terms - a glossary

SIC codes - get the SIC number for any industry or specialty.

Synonyms - a thesaurus.

Words, phrases, translations - a dictionary

IRS Current Forms and Publications

1099 A and C Instructions (2007)

2006 W-2 and W-3 Instructions (does not include forms).

Employer-provided benefits - how to tax, Publication 15-B Fringe Benefits.

I-9 - pdf of Employment Eligibility Verification.

Internal Revenue Manual.

IRS forms (8109-B etc.) by mail - instead of pdfs or online.

Market Segment Specialization Program Audits - obtain a copy of the IRS Examiner Training Manuals for your industry or profession.

Standard Mileage Rates for 2006 - IRS News Release

Standard Mileage Rates for 2007 - IR-2006-168

Tax withholding and estimated taxes - Publication 505.

Withholding tables - Publication 15-T.

IRS Prior-Year Forms and Publications

1992 forms and publications - hard-to-find forms.

1993 forms and publications - hard-to-find forms.

1994 forms and publications - hard-to-find forms.

1995 forms and publications - hard-to-find forms.

1996 forms and publications - hard-to-find forms.

1997 forms and publications - hard-to-find forms.

1998 forms and publications—hard-to-find forms.

1999 forms and publications—hard-to-find forms.

2000 forms and publications—hard-to-find forms.

2001 forms and publications—hard-to-find forms.

2002 forms and publications.—hard-to-find forms

2003 forms and publications - hard-to-find forms

2004 forms and publications - hard-to-find forms

2005 forms and publications - hard-to-find forms

IRS - by Industry or Profession

Agriculture - IRS rules, regulations and resources.

Automotive - IRS rules, regulations and resources.

Construction - IRS rules, regulations and resources.

Cosmetology - IRS rules, regulations and resources.

Entertainment - IRS rules, regulations and resources.

Gas Retailers - IRS rules, regulations and resources.

Manufacturing - IRS rules, regulations and resources.

Real Estate - IRS rules, regulations and resources.

Restaurants - IRS rules, regulations and resources.

Tax professionals - IRS rules, regulations and resources.

Nonprofit Organizations (NPOs)

Accounting regulations - for NPOs, including governmental entities.

Accounting standards - for NPOs.

Accounting - type in the search box the word “accounting” or narrower subject.

California Association of Nonprofits - offers numerous resources for NPO's.

Contributions - FASB Pronouncement No. 116 “Accounting for Contributions Received and Contributions made”

Databases - how to choose the right one for your NPO; what to look for in a database.

FINANCIAL ACCOUNTING FOR NPOs.Financial Accounting Regulation for Nonprofit Organizations

Financial statements - FASB 117 “Financial Statement of Not-For-Profit Organization.”

Form 990 - how to read it and what it means.

Governmental Accounting Standards Board - for government entities.

GuideStar - all kinds of information for NPOs. Free registration may be required.

Management - free library comprises 72 categories including finance, benefits administration and compensation and includes NPO topics.

NPO links - useful links for NPOs (be sure to scroll down).

Other revenue (UBIT) - rules, regs and reporting.

Reporting regulations - for the states.

Reporting regulations - IRS rules and regs.

Revenue from exempt-purpose activities - rules, regs and reporting.

Revenue from public support - rules, regs and reporting.

Software - a list of available NPO software

Tax - at the top of this page, type in “tax” or narrower subject at the top of the page.

State by state

Sales tax rates - state-by-state sales taxes.

State departments of labor - state-by-state labor offices, commissioners, directors, and secretaries.

State by state revenue departments - state by state.

State tax forms - state by state.

State tax withholding tables and publications - state by state.

State-by-state taxes - Each state’s income tax, sales tax, etc.