Federal and FICA have been updated for 2008
Iowa rates changed effective April 1, 2006. I couldn't find anything about 2008, so I assume they didn't change.
Wisconsin rates did not change for 2008.
Minnesota, Ohio & North Dakota have new rates for 2008.

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Federal Single:

 TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: FD       STATUS (Single,Married,Head,Unemployment): S

        AMOUNT     DESCRIPTION
 A: 3500______     DEDUCTION_____________________
        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______2650  _________0  _________0
 2:     ______2650  _____10300  _________0  ________10
 3:     _____10300  _____33960  ____765.00  ________15
 4:     _____33960  _____79725  ___4314.00  ________25
 5:     _____79725  ____166500  __15755.25  ________28
 6:     ____166500  ____359650  __40052.25  ________33
 7:     ____359650  9999999999  _103791.75  ________35
F1=CLEAR CURRENT FIELD, F5=EXIT, ESC=SAVE DATA, F7=HELP, F3=PROG. FUNC. KEYS.

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Federal Married:

 TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: FD       STATUS (Single,Married,Head,Unemployment): M

        AMOUNT     DESCRIPTION
 A: 3500______     DEDUCTION_____________________
        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______8000  _________0  _________0
 2:     ______8000  _____23550  _________0  ________10
 3:     _____23550  _____72150  ___1555.00  ________15
 4:     _____72150  ____137850  ___8845.00  ________25
 5:     ____137850  ____207700  __25270.00  ________28
 6:     ____207700  ____365100  __44828.00  ________33
 7:     ____365100  9999999999  __96770.00  ________35
F1=CLEAR CURRENT FIELD, F5=EXIT, ESC=SAVE DATA, F7=HELP, F3=PROG. FUNC. KEYS.
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FICA:

 TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: FI       STATUS (Single,Married,Head,Unemployment):

        AMOUNT     DESCRIPTION
 A: ______7.65     EMPLOYEE_FICA+MEDICARE_%_RATE_
 B: ______7.65     EMPLOYER_FICA+MEDICARE_%_RATE_
 C: ____102000     FICA_WAGE_LIMIT_______________
 D: ______1.45     EMPLOYEE_MEDICARE_%_RATE______
 E: ______1.45     EMPLOYER_MEDICARE_%_RATE______
 F: 9999999999     MEDICARE_LIMIT________________
 G: __________     ______________________________

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MINNESOTA:

TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: MN       STATUS (Single,Married,Head,Unemployment): S

        AMOUNT     DESCRIPTION
 A: 3500______     EXEMPTION_____________________
 
        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______1950  _________0  _________0
 2:     ______1950  _____23750  _________0  ______5.35
 3:     _____23750  _____73540  ___1166.30  ______7.05
 4:     _____73540  9999999999  ___4676.50  ______7.85
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 TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: MN       STATUS (Single,Married,Head,Unemployment): M

        AMOUNT     DESCRIPTION
 A: ______3500     EXEMPTION_____________________

        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______7400  _________0  _________0
 2:     ______7400  _____39260  _________0  ______5.35
 3:     _____39260  ____133980  ___1704.51  ______7.05
 4:     ____133980  9999999999  ___8382.27  ______7.85

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NORTH DAKOTA:

 TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: ND       STATUS (Single,Married,Head,Unemployment): S

        AMOUNT     DESCRIPTION
 A: 3500.00___     EXEMPTION_ALLOWANCE___________
        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______3700  _________0  _________0
 2:     ______3700  _____34600  _________0  ______2.10
 3:     _____34600  _____72800  ____648.90  ______3.92
 4:     _____72800  ____166300  ___2146.34  ______4.34
 5:     ____166300  ____359200  ___6204.24  ______5.04
 6:     ____359200  9999999999  __15926.40  ______5.54

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TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: ND       STATUS (Single,Married,Head,Unemployment): M

        AMOUNT     DESCRIPTION
 A: 3500.00___     EXEMPTION_ALLOWANCE___________
        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______9000  _________0  _________0
 2:     ______9000  _____61600  _________0  ______2.10
 3:     _____61600  ____116900  ___1104.60  ______3.92
 4:     ____116900  ____208200  ___3272.36  ______4.34
 5:     ____208200  ____364700  ___7234.78  ______5.04
 6:     ____364700  9999999999  __15122.38  ______5.54


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OHIO:
 TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 08
 STATE ID, FD, or FI: OH       STATUS (Single,Married,Head,Unemployment): S

        AMOUNT     DESCRIPTION
 A: 650_______     EXEMPTION_____________________
        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______5000  __________  ______.672
 2:     ______5000  _____10000  _____33.60  _____1.344
 3:     _____10000  _____15000  ____100.80  _____2.687
 4:     _____15000  _____20000  ____235.20  _____3.360
 5:     _____20000  _____40000  ____403.20  _____4.031
 6:     _____40000  _____80000  ___1209.35  _____4.703
 7:     _____80000  ____100000  ___3090.55  _____5.375
 8:     ____100000  9999999999  ___4165.55  _____6.718

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IOWA:

 TAX TABLE MAINTENANCE  BY JARVIS COMPUTER SOFTWARE (C) COPYRIGHT 1989, 1995
                          ALL RIGHTS RESERVED.
 YEAR: 06
 STATE ID, FD, or FI: IA       STATUS (Single,Married,Head,Unemployment): S

        AMOUNT     DESCRIPTION
 A: 1650______     STANDARD_DEDUCTION,_0-1_EXEMPT
 B: ______4060     STANDARD_DEDUCTION,_2+_EXEMPTS
 C: ________40     CREDIT,_1-2_EXEMPTIONS________
 D: ________40     CREDIT,_3+_EXEMPTIONS_________
        THRESHOLD      CEILING        BASE      % RATE
 1:     _________0  ______1300  _________0  ______0.36
 2:     ______1300  ______2600  ______4.68  ______0.72
 3:     ______2600  ______5200  _____14.04  ______2.43
 4:     ______5200  _____11700  _____77.22  ______4.50
 5:     _____11700  _____19500  ____369.72  ______6.12
 6:     _____19500  _____26000  ____847.08  ______6.48
 7:     _____26000  _____39000  ___1268.28  ______6.80
 8:     _____39000  _____58500  ___2152.28  ______7.92
 9:     _____58500  9999999999  ___3696.68  ______8.98