OTTAWA – Canada Post is proposing to increase postage rates in 2019. The postage rate for domestic LettermailTM items weighing 30 grams or less when purchased in a booklet, coil or pane would increase to $0.90 from the current rate of $0.85. The price of a single domestic stamp would increase to $1.05 from the current rate of $1.00. The rate change would take effect on January 14, 2019."
From Wikipedia (probably not the best source):
"The lettermail service allows the transmission of virtually any paper document. The 2015 to 2018 rate was 85 cents for a standard letter (30 g or less) and $1.20 for a letter between 30 g and 50 g. Proposed change for 2019 is 90 cents and $1.27 for these rates. Rates usually increase in mid-January of each year; for ordinary letters (30 g or less).The rate was regulated by a price-cap formula, linked to the inflation rate. The Corporation now has a "permanent" stamp that is valued at the domestic rate forever, eliminating the need to buy 1 cent stamps after a rate increase. "
From 2014 when the huge jump in lettermail occurred, key point highlighted in red.
OTTAWA (Ont.) – As announced in December, Canada Post is introducing a new tiered pricing structure for domestic and international letters. The regulatory process has concluded and documents will soon be published in the Canada Gazette Part II.
On March 31, the price of Permanent (or “P”) stamps bought in booklets, coils and panes will be $0.85 per stamp, up from $0.63 today. “P” stamps are valid on standard letters 0-30 g mailed within Canada. A $0.22 stamp will be available as make-up postage for 0-30 g letters for those customers who wish to use previously purchased $0.63 stamps.
With the same reasoning, I should have been using $1.00 of postage instead of 85 cents the past 5 years and over 25,000 envelopes mailed. Postage costs for lettermail did not jump 20 cents overnight, otherwise my torches and pitchforks would be listed for the angry mobs and I would be making a killing.
Yes, I have received envelopes back last couple of years that had insufficient postage, but only on the ones where I had forgotten the 5 cent stamp (20 cent x4 + 5 cent x1).
Anyways, need to drop off another 15 envelopes shortly at my alternate post office, which also has a postmaster that's on the 90 cent side.