Interest on Capital – 10 Calculation Methods

When are Drawings Ignored or Considered?

Scenario Drawings Ignored?
Only opening capital given ✅ Ignored
Opening + additional capital (with date) ✅ Ignored
Drawings given BUT no dates ✅ Ignored (can't calculate otherwise)
Drawings given WITH DATES ❌ Considered (use product method)

Methods

1. Only Opening Capital Given

Partner A: Opening Capital ₹1,00,000, Interest 10% p.a.

Interest = ₹1,00,000 × 10% = ₹10,000

2. With Additional Capital Only (No Drawings)

Partner B: Opening ₹80,000, Additional ₹20,000 on 1 July, Interest 10%, Year end 31 Dec.

Interest = (₹80,000 × 10%) + (₹20,000 × 10% × 6/12) = ₹8,000 + ₹1,000 = ₹9,000

3. With Drawings Only (Drawings Ignored – Simple Method, No Dates)

Partner C: Opening ₹1,50,000, Drawings ₹30,000, Interest 10%.

Interest = ₹1,50,000 × 10% = ₹15,000 (Drawings ignored because no dates given.)

4. With Additional Capital and Drawings (Drawings Ignored – Simple Method, No Dates)

Partner D: Opening ₹2,00,000, Additional ₹50,000 on 1 July, Drawings ₹40,000, Interest 10%, Year end 31 Dec.

Interest = (₹2,00,000 × 10%) + (₹50,000 × 10% × 6/12) = ₹20,000 + ₹2,500 = ₹22,500 (Drawings ignored.)

5. Finding Opening Capital When Missing

Closing Capital ₹1,80,000 + Drawings ₹20,000 – (Additional ₹30,000 + Share of Profit ₹50,000 + Salary ₹10,000) = Opening ₹1,10,000

Interest @10% = (₹1,10,000 × 10%) + (₹30,000 × 10% × 6/12) = ₹11,000 + ₹1,500 = ₹12,500

6. Firm Incurs a Loss

Partners F (₹2,50,000) and G (₹1,50,000), Interest 10%, Loss ₹40,000.

No interest allowed (unless deed specifically permits). Loss shared in profit‑sharing ratio.

7. Profit Less Than Total Interest Due

Interest Due: H ₹12,000, I ₹8,000 (Total ₹20,000). Profit Available: ₹15,000.

Distribution in ratio 12:8 = 3:2
H = (3/5) × ₹15,000 = ₹9,000
I = (2/5) × ₹15,000 = ₹6,000

8. Product Method – With Additional Capital Only (Dates Considered)

Partner J: Opening ₹1,00,000 on 1 April; Additional ₹20,000 on 1 July. Interest 10%, year ends 31 March.

Products: Apr–Jun: ₹1,00,000 × 3 = 3,00,000; Jul–Mar: ₹1,20,000 × 9 = 10,80,000; Total = 13,80,000
Interest = (13,80,000 × 10/100) / 12 = ₹1,38,000 / 12 = ₹11,500

9. Product Method – With Drawings Only (Dates Considered)

Partner K: Opening ₹2,00,000 on 1 April; Drawings ₹10,000 on 1 October. Interest 10%, year ends 31 March.

Products: Apr–Sep: ₹2,00,000 × 6 = 12,00,000; Oct–Mar: ₹1,90,000 × 6 = 11,40,000; Total = 23,40,000
Interest = (23,40,000 × 10/100) / 12 = ₹2,34,000 / 12 = ₹19,500

10. Product Method – With Both Additional Capital and Drawings (Dates Considered)

Partner L: Opening ₹1,00,000 on 1 April; Additional ₹20,000 on 1 July; Drawings ₹10,000 on 1 October. Interest 10%, year ends 31 March.

Products: Apr–Jun: ₹1,00,000 × 3 = 3,00,000; Jul–Sep: ₹1,20,000 × 3 = 3,60,000; Oct–Mar: ₹1,10,000 × 6 = 6,60,000; Total = 13,20,000
Interest = (13,20,000 × 10/100) / 12 = ₹1,32,000 / 12 = ₹11,000

About the author

SIMON PAVARATTY
PSMVHSS Kattoor, Thrissur

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