Economic Appraisal Guidance
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NI Practical Guide to the Green Book

Table 2: Discount Factors @ 1% To 10% pa

Discount Rates
Year 1.0% 2.0% 3.0% 3.5% 4.0% 5.0% 6.0% 7.0% 8.0% 9.0% 10.0%
0 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000
1 0.9901 0.9804 0.9709 0.9662 0.9615 0.9524 0.9434 0.9346 0.9259 0.9174 0.9091
2 0.9803 0.9612 0.9426 0.9335 0.9246 0.9070 0.8900 0.8734 0.8573 0.8417 0.8264
3 0.9706 0.9423 0.9151 0.9019 0.8890 0.8638 0.8396 0.8163 0.7938 0.7722 0.7513
4 0.9610 0.9238 0.8885 0.8714 0.8548 0.8227 0.7921 0.7629 0.7350 0.7084 0.6830
5 0.9515 0.9057 0.8626 0.8420 0.8219 0.7835 0.7473 0.7130 0.6806 0.6499 0.6209
6 0.9420 0.8880 0.8375 0.8135 0.7903 0.7462 0.7050 0.6663 0.6302 0.5963 0.5645
7 0.9327 0.8706 0.8131 0.7860 0.7599 0.7107 0.6651 0.6227 0.5835 0.5470 0.5132
8 0.9235 0.8535 0.7894 0.7594 0.7307 0.6768 0.6274 0.5820 0.5403 0.5019 0.4665
9 0.9143 0.8368 0.7664 0.7337 0.7026 0.6446 0.5919 0.5439 0.5002 0.4604 0.4241
10 0.9053 0.8203 0.7441 0.7089 0.6756 0.6139 0.5584 0.5083 0.4632 0.4224 0.3855
11 0.8963 0.8043 0.7224 0.6849 0.6496 0.5847 0.5268 0.4751 0.4289 0.3875 0.3505
12 0.8874 0.7885 0.7014 0.6618 0.6246 0.5568 0.4970 0.4440 0.3971 0.3555 0.3186
13 0.8787 0.7730 0.6810 0.6394 0.6006 0.5303 0.4688 0.4150 0.3677 0.3262 0.2897
14 0.8700 0.7579 0.6611 0.6178 0.5775 0.5051 0.4423 0.3878 0.3405 0.2992 0.2633
15 0.8613 0.7430 0.6419 0.5969 0.5553 0.4810 0.4173 0.3624 0.3152 0.2745 0.2394
16 0.8528 0.7284 0.6232 0.5767 0.5339 0.4581 0.3936 0.3387 0.2919 0.2519 0.2176
17 0.8444 0.7142 0.6050 0.5572 0.5134 0.4363 0.3714 0.3166 0.2703 0.2311 0.1978
18 0.8360 0.7002 0.5874 0.5384 0.4936 0.4155 0.3503 0.2959 0.2502 0.2120 0.1799
19 0.8277 0.6864 0.5703 0.5202 0.4746 0.3957 0.3305 0.2765 0.2317 0.1945 0.1635
20 0.8195 0.6730 0.5537 0.5026 0.4564 0.3769 0.3118 0.2584 0.2145 0.1784 0.1486
21 0.8114 0.6598 0.5375 0.4856 0.4388 0.3589 0.2942 0.2415 0.1987 0.1637 0.1351
22 0.8034 0.6468 0.5219 0.4692 0.4220 0.3418 0.2775 0.2257 0.1839 0.1502 0.1228
23 0.7954 0.6342 0.5067 0.4533 0.4057 0.3256 0.2618 0.2109 0.1703 0.1378 0.1117
24 0.7876 0.6217 0.4919 0.4380 0.3901 0.3101 0.2470 0.1971 0.1577 0.1264 0.1015
25 0.7798 0.6095 0.4776 0.4231 0.3751 0.2953 0.2330 0.1842 0.1460 0.1160 0.0923
26 0.7720 0.5976 0.4637 0.4088 0.3607 0.2812 0.2198 0.1722 0.1352 0.1064 0.0839
27 0.7644 0.5859 0.4502 0.3950 0.3468 0.2678 0.2074 0.1609 0.1252 0.0976 0.0763
28 0.7568 0.5744 0.4371 0.3817 0.3335 0.2551 0.1956 0.1504 0.1159 0.0895 0.0693
29 0.7493 0.5631 0.4243 0.3687 0.3207 0.2429 0.1846 0.1406 0.1073 0.0822 0.0630
30 0.7419 0.5521 0.4120 0.3563 0.3083 0.2314 0.1741 0.1314 0.0994 0.0754 0.0573

Return to Appendix 7