freespace · June 4, 2014 10:05 · Jun 4, 2014
diff --git a/hecs-repayment-years.py b/hecs-repayment-years.py
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+"""
+Created on Sat May 31 11:35:04 2014
+
+@author: freespace
+"""
+
+def repayment_pc(earning):
+    thresholds = [   [59421, 0.04],
+                    [65497, 0.045],
+                    [68939, 0.05],
+                    [74105, 0.055],
+                    [80257, 0.06],
+                    [84481, 0.065],
+                    [92970, 0.07],
+                    [99069, 0.075],
+                ]
+    for upperthres, pc in thresholds:
+        if earning < upperthres:
+            return pc
+    # this is the max repayment rate
+    return 0.08
+
+debt=50e3
+interest = 0.06
+earning = 60e3
+max_earning = 65e3
+yearly_raise = 0.03
+years = 0
+max_years= 100
+
+while debt > 0:
+    payment = repayment_pc(earning) * earning 
+    debt -= payment
+    debt *= (1+interest)
+    earning *= (1+yearly_raise)
+    earning = min(earning, max_earning)
+    years += 1
+    print years, debt, interest, earning, payment
+
+    if years > max_years:
+        break