This was a real puzzle. The requirements were a little strange in that the lower and upper limits of the tiers were NOT inclusive which is assumed by the links provided by others. Below is the worksheet I put together and the formulas are listed below that. You can see in your $500,000 example that the sum of the cells G3 and G4 total your example bonus. Cell F11 would accept the input of the total commissions and fees and is a named range "Comm" in the formulas.
<colgroup><col style="width: 25pxpx"><col><col><col><col><col><col><col></colgroup><thead>
</thead><tbody>
[TD="align: center"]1[/TD]
[TD="align: center"]Tiers[/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"]Tier Range[/TD]
[TD="align: center"]Pct[/TD]
[TD="align: center"]Comm & Fees[/TD]
[TD="align: center"]Bonus[/TD]
[TD="align: center"]2[/TD]
[TD="align: center"][/TD]
[TD="align: right"] - [/TD]
[TD="align: right"] 100,000 [/TD]
[TD="align: right"] 100,000.00 [/TD]
[TD="align: center"]0%[/TD]
[TD="align: right"] $ 100,000.00 [/TD]
[TD="align: right"] $ - [/TD]
[TD="align: center"]3[/TD]
[TD="align: center"]1[/TD]
[TD="align: right"] 100,000 [/TD]
[TD="align: right"] 199,999 [/TD]
[TD="align: right"] 100,000.00 [/TD]
[TD="align: center"]1%[/TD]
[TD="align: right"] 99,999.00 [/TD]
[TD="align: right"] 999.99 [/TD]
[TD="align: center"]4[/TD]
[TD="align: center"]2[/TD]
[TD="align: right"] 200,000 [/TD]
[TD="align: right"] 499,999 [/TD]
[TD="align: right"] 300,000.00 [/TD]
[TD="align: center"]2%[/TD]
[TD="align: right"] 299,999.00 [/TD]
[TD="align: right"] 5,999.98 [/TD]
[TD="align: center"]5[/TD]
[TD="align: center"]3[/TD]
[TD="align: right"] 500,000 [/TD]
[TD="align: right"] 749,999 [/TD]
[TD="align: right"] 250,000.00 [/TD]
[TD="align: center"]3%[/TD]
[TD="align: right"] 249,999.00 [/TD]
[TD="align: right"] 7,499.97 [/TD]
[TD="align: center"]6[/TD]
[TD="align: center"]4[/TD]
[TD="align: right"] 750,000 [/TD]
[TD="align: right"] 1,000,000 [/TD]
[TD="align: right"] 250,000.00 [/TD]
[TD="align: center"]4%[/TD]
[TD="align: right"] 250,000.00 [/TD]
[TD="align: right"] 10,000.00 [/TD]
[TD="align: center"]7[/TD]
[TD="align: center"]5[/TD]
[TD="align: right"] 1,000,001 [/TD]
[TD="align: right"] 2,000,000 [/TD]
[TD="align: right"] 1,000,000.00 [/TD]
[TD="align: center"]5%[/TD]
[TD="align: right"] 999,999.00 [/TD]
[TD="align: right"] 49,999.95 [/TD]
[TD="align: center"]8[/TD]
[TD="align: center"]6[/TD]
[TD="align: right"] 2,000,001 [/TD]
[TD="align: right"] 3,000,000 [/TD]
[TD="align: right"] 1,000,000.00 [/TD]
[TD="align: center"]6%[/TD]
[TD="align: right"] 999,999.00 [/TD]
[TD="align: right"] 59,999.94 [/TD]
[TD="align: center"]9[/TD]
[TD="align: center"]7[/TD]
[TD="align: right"] 3,000,001 [/TD]
[TD="align: right"] 4,000,000 [/TD]
[TD="align: right"] 1,000,000.00 [/TD]
[TD="align: center"]7%[/TD]
[TD="align: right"] 999,999.00 [/TD]
[TD="align: right"] 69,999.93 [/TD]
[TD="align: center"]10[/TD]
[TD="align: center"]8[/TD]
[TD="align: right"] 4,000,000 [/TD]
[TD="align: right"] 100,000,000 [/TD]
[TD="align: right"][/TD]
[TD="align: center"]8%[/TD]
[TD="align: right"] 6,000,000.00 [/TD]
[TD="align: right"] 480,000.00 [/TD]
[TD="align: center"]11[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="bgcolor: <a href=, align: right"]#A9D08E ;;"> $10,000,000.00 [/TD]
[TD="bgcolor: <a href=, align: right"]#A9D08E ;;"> $ 684,499.76 [/TD]
</tbody>
Sheet1
[TABLE="width: 85%"]
<tbody>[TR]
[TD]
Worksheet Formulas[TABLE="width: 100%"]
<thead>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]
[TH="width: 10px"]Cell[/TH]
[TH="align: left"]Formula[/TH]
[/TR]
</thead><tbody>[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]D2[/TH]
[TD="align: left"]=F2[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F2[/TH]
[TD="align: left"]=IF(
Comm>=C2,C2,Comm)[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G2[/TH]
[TD="align: left"]=E2*F2[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F3[/TH]
[TD="align: left"]=IF(
Comm>C3,C3-B3,IF((Comm-SUM($D$2:D2))<0,0,(Comm-SUM($D$2:D2))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G3[/TH]
[TD="align: left"]=E3*F3[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F4[/TH]
[TD="align: left"]=IF(
Comm>C4,C4-B4,IF((Comm-SUM($D$2:D3))<0,0,(Comm-SUM($D$2:D3))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G4[/TH]
[TD="align: left"]=E4*F4[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F5[/TH]
[TD="align: left"]=IF(
Comm>C5,C5-B5,IF((Comm-SUM($D$2:D4))<0,0,(Comm-SUM($D$2:D4))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G5[/TH]
[TD="align: left"]=E5*F5[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F6[/TH]
[TD="align: left"]=IF(
Comm>C6,C6-B6,IF((Comm-SUM($D$2:D5))<0,0,(Comm-SUM($D$2:D5))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G6[/TH]
[TD="align: left"]=E6*F6[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F7[/TH]
[TD="align: left"]=IF(
Comm>C7,C7-B7,IF((Comm-SUM($D$2:D6))<0,0,(Comm-SUM($D$2:D6))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G7[/TH]
[TD="align: left"]=E7*F7[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F8[/TH]
[TD="align: left"]=IF(
Comm>C8,C8-B8,IF((Comm-SUM($D$2:D7))<0,0,(Comm-SUM($D$2:D7))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G8[/TH]
[TD="align: left"]=E8*F8[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F9[/TH]
[TD="align: left"]=IF(
Comm>C9,C9-B9,IF((Comm-SUM($D$2:D8))<0,0,(Comm-SUM($D$2:D8))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G9[/TH]
[TD="align: left"]=E9*F9[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]F10[/TH]
[TD="align: left"]=IF(
Comm>C10,C10-B10,IF((Comm-SUM($D$2:D9))<0,0,(Comm-SUM($D$2:D9))))[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G10[/TH]
[TD="align: left"]=E10*F10[/TD]
[/TR]
[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]G11[/TH]
[TD="align: left"]=SUM(
G2:G10)[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]
[TABLE="width: 85%"]
<tbody>[TR]
[TD]
Workbook Defined Names[TABLE="width: 100%"]
<thead>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]
[TH="width: 10px"]Name[/TH]
[TH="align: left"]Refers To[/TH]
[/TR]
</thead><tbody>[TR]
[TH="width: 10px, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]Comm[/TH]
[TD="align: left"]=Sheet1!$F$11[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]