$169 (+$7 S/H).
- If you have delinquent returns to file, this program can save money. Use
this calculator to figure how much IRS late payment interest is owed with the late returns.
If you pay the interest when the delinquent returns are filed, you are better off than
waiting for the IRS to figure the interest. In other words, waiting to pay
the interest will cost you, and you will have to deal with more notices from
- If you have an IRS audit in progress, use this program to figure the IRS
interest and penalties. You are better off knowing this before the IRS
sends out a notice. You might even be able to use this information in
- If you have payroll tax penalties, this calculator can often reduce penalties
by suggesting the order that payments should be applied to liabilities.
- Use this program to calculate interest on amended returns that have
tax due. If you don't do this, the IRS will compute the interest, and
your client will get a notice which you will have to explain to your client.
- In bankruptcy, you should be able to get the penalties removed.
The IRS has a problem with overcharging interest in this situation. Show
the IRS the program's interest computation report, and the IRS should reduce
the interest assessment. We have bankruptcy attorney customer who has a
100% success rate using this strategy. Most IRS employees don't want to
refute our program's reports.
- If you have an IRS notice, it might be wrong. This program can be
used to find the error. IRS errors and mistakes happen more frequently
when IRS employees are personally involved with the computation than when the
notice is completely automated.
- Some businesses may deduct interest paid to the IRS. The
IRS/State Interest & Penalty Calculator can be very helpful in planning these
- When a taxpayer with a tax lien is attempting to buy or sell real estate,
use this program to determine how much to put in escrow to pay off the lien.
- This will work for excise tax situations as well as income tax and payroll
Don't take the word of the IRS or the state on how much your clients owe in interest
and penalties - they can be wrong! Use this program to calculate the interest and
penalties on underpaid taxes. This is both a tax interest calculator
and a tax penalty calculator. For over 19 years tax professionals have been using this
program to plan and double check the IRS. In fact, the Internal Revenue Service offices
are using this program to check their own calculations! Here's just a sample of why this
program is so valuable:
It automatically calculates:
- State support for AR, CA, FL, GA, ID, IL, KY, LA, MA, MD, MI, MN, MO, NY, PA, RI, SC, UT, VA, VT and
- Days between dates and interest rate factors.
- Unlimited number of payments before settlement date.
- The 120% tax motivated interest.
- Failure to file and the .5% and 1% failure to pay penalties.
- Penalties for late payment of payroll tax deposits. Thus, this
program will calculate interest and penalties for both income tax and payroll tax
- Accuracy related penalties, including - Negligence, Substantial
Understatement, Substantial Valuation Misstatement, Substantial Overstatement
of Pension Liabilities, Substantial Estate or Gift Tax Valuation
Understatement and the Economic Substance penalty (new for transactions
entered into after March 30, 2010).
- Calculates as far back as 1954!
- Interest on refunds.
- Corporate 2% interest increase after 1990.
For more comprehensive information, download the program's manual.
Since the IRS interest rate is objectively determined, the IRS interest
computation is frequently used in determining interest on judgments. The
IRS/State Interest & Penalty Calculator can be used to determine interest owed
How to compute IRS interest without
Customers Have To Say...
user friendly, quick and accurate.”
Janice Lancaster, Denver, CO.
great in a short period of time.”
Harry Rabin, EA, Harry Rabin & Co, El Cerrito, CA.
a lot of headaches.”
Robert Mathers, The Hunter Group, CPA, LLC,
Fair Lawn, NJ
support to argue with the IRS.”
Ambrose Rouble, CPA, Southgate, MI
total amount due of about $8,200 is off by 10 cents compared to the IRS's
computation. Thank you very much for your patience and graciousness in helping
John M. Hasslinger, CPA, Mount Airy, MD
what other customers are saying...
The penalty calculations strictly follow the Federal law. Thus, if the state penalty
computation is *identical* to the Federal computation, you can use this program. If the
state penalty computation is different, you can put it into the program as an Other
This program currently supports interest rates for AR, CA, FL, GA, MA, MO, ID, KY, SC, LA, MD, MN,
UT, VT, V, VA, IL, MI and PA. Sometimes the states drag their feet in releasing interest
rates. It is not unusual for us to release the program before all states have announced
the new interest rate. Click here to get the status of state
rates and update state rate files for the program.
If you would like us to support other states, please email or fax us the
information needed to create a state interest table. To create a state interest table, we
would need to know the interest rates for each interest rate period, what rates are simple
or compound interest, whether interest is computed differently for individuals compared to
businesses, how frequently interest rates are to change, how interest rates are
determined, and what is the best way to learn of future rate changes. Our email address is
"info AT denvertax.com" (We are listing the email
address this way to reduce SPAM! Replace the AT with @ and remove the spaces.), and our fax number is 303.796.7768. State rates will be added as time
Current Calculator Version
As of January 23, 2017 we started shipping the 2017, Quarter 2 version,
WINT2017Q2.10. This version has verified IRS interest rates and IRS
interest rate factors through June 30, 2017.