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Creating a table showing Sum-of-digits

The table shows total-year debt repayment (Sum-of-digits) as a method of interest distribution that accelerates payments in the early stages (similar to calculating total-year depreciation), with interest decreasing gradually over the life of the contract 😎💚.# excelsoezy # Excel # Exceltricks # exceltips # Lemon 8 Howtoo

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... Read moreการใช้สูตร PMT ร่วมกับวิธีการ Sum-of-digits นั้นเป็นเทคนิคที่ผมได้ลองนำไปใช้ในงานคำนวณชำระหนี้ ต้นแบบกู้เงิน 60,000 บาท กับอัตราดอกเบี้ย 16% ต่อปี ทบต้นทุกๆ 6 เดือน เป็นเวลา 3 ปี ผมพบว่าวิธีนี้ช่วยให้ตารางชำระหนี้แสดงให้เห็นยอดดอกเบี้ยที่ลดลงตามลำดับเวลาจริง ๆ ซึ่งต่างจากการคิดดอกเบี้ยแบบคงที่ ผมเริ่มจากการกรอกข้อมูลเบื้องต้น เช่น จำนวนเงินกู้ (PV), อัตราดอกเบี้ยต่อช่วงเวลาที่กำหนด, และจำนวนงวดที่จะชำระคืน จากนั้นใช้สูตร SEQUENCE เพื่อจัดทำลำดับงวดการชำระหนี้ตั้งแต่ 1 ถึงจำนวนงวดทั้งหมด จากนั้นสร้างฟังก์ชันคำนวณส่วนลดดอกเบี้ยในแต่ละงวด โดยคูณผลรวมของลำดับงวด (Sum-of-digits) เข้ากับค่างวดทั้งหมด วิธีนี้ทำให้ดอกเบี้ยถูกเร่งในช่วงต้นงวด ลดลงเรื่อย ๆ ในงวดถัดไป ซึ่งช่วยลดภาระดอกเบี้ยในระยะยาว สูตร PMT จะถูกใช้เพื่อหายอดชำระเงินต่องวดที่เท่ากัน เพื่อให้ง่ายต่อการติดตามและบริหารจัดการการเงิน นอกจากนี้ การคำนวณเงินต้นยังช่วยแสดงยอดเงินที่เหลือคงค้างได้อย่างชัดเจน ถ้าใครที่สนใจ สามารถนำตัวอย่างนี้ไปทดลองสร้างตาราง Amortization Table แบบลดต้นลดดอกใน Excel เองได้เลยครับ สิ่งที่ผมชอบที่สุดคือความชัดเจนและโปร่งใสของข้อมูล ทำให้วางแผนการเงินได้ดีกว่าเดิมเยอะเลยครับ

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