I haven't seen a post about this recently so I thought I'd share some in game experience with the 20K cap/bug in another effort to get it removed/fixed. 6 turns is all it took to go from a solid economy to complete production shutdown and back.
Rev from taxes is 283840. Allocated spending is 235936. Net income +56126. Curent Balance +19447 (green).
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Rev from taxes is 201169. Allocated spending is 235936. Net income -26543. Curent Balance +75603 (yellow).
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Rev from taxes is 201187. Allocated spending is 235936. Net income -26523. Curent Balance +49080 (yellow).
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Rev from taxes is 201379. Allocated spending is 236148. Net income -26723. Curent Balance +22576 (yellow).
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Rev from taxes is 284149. Allocated spending is 63408. Net income +228896. Curent Balance -4130 (orange).
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Rev from taxes is 201412. Allocated spending is 236148. Net income -26686. Curent Balance +224789 (yellow).