accounts payable and accrued liabilities, an increase of $153.0 million in the carrying amount of the Notes due to the adoption of ASU 2020-06 in the period resulting in a single unit of account on the balance sheet, and a $107.6 million increase in lease liabilities, offset by a $6.2 million decrease in income taxes payable.
Liquidity and Capital Resources
To date, we have financed our operations primarily through the sale of equity securities as well as the sale of the Notes, raising approximately $7.8 billion, net of issuance costs, from investors.
In July 2021, we filed an amended and restated short-form base shelf prospectus with the securities commissions in each of the provinces and territories of Canada, except Quebec, and a corresponding shelf registration statement on Form F-10 with the U.S. Securities and Exchange Commission. The shelf prospectus and registration statement allows Shopify to offer Class A subordinate voting shares, preferred shares, debt securities, warrants, subscription receipts, units, or any combination thereof, from time to time during the 25-month period the shelf prospectus is effective, which commenced August 6, 2020. The amendment increased the total amount Shopify can offer under the shelf prospectus and registration statement to $10 billion.
In February 2021, the Company completed a public offering in which it issued and sold 1,180,000 Class A subordinate voting shares at a public offering price of $1,315.00 per share. The Company received total net proceeds of $1,541.2 million after deducting offering fees and expenses of $10.5 million.
In September 2020, the Company completed a public offering in which it issued and sold 1,265,000 Class A subordinate voting shares at a public offering price of $900.00 per share, including 165,000 Class A subordinate voting shares purchased by the underwriters pursuant to the exercise of the over-allotment option. The Company received total net proceeds of $1,117.6 million after deducting offering fees and expenses of $20.9 million.
In September 2020, the Company also issued $920.0 million aggregate principal amount of 0.125% convertible senior notes due 2025. The net proceeds from the issuance of the Notes were $908.0 million after deducting underwriting discounts and offering costs. The Notes have an initial conversion rate of 0.6944 Class A subordinate voting shares per one thousand dollars of principal amount of Notes, which is equivalent to an initial conversion price of approximately $1,440.09 per share. The Notes bear cash interest at 0.125% per year and, if we undergo a “fundamental change” (which includes a change of control of more than 50% of our common equity or our liquidation or dissolution) prior to the maturity date of the Notes, we will, subject to limited exceptions, be required to purchase for cash all outstanding Notes at a purchase price equal to 100% of the principal amount of the Notes, plus accrued and unpaid interest to, but excluding, the fundamental change purchase date.
In July 2020, due to the expiry of our previous short-term base shelf prospectus, we filed a new short-form base shelf prospectus with the securities commissions in each of the provinces and territories of Canada, except Quebec, and a corresponding shelf registration statement on Form F-10 with the U.S. Securities and Exchange Commission. This shelf prospectus and registration statement allows Shopify to offer up to $7.5 billion of Class A subordinate voting shares, preferred shares, debt securities, warrants, subscription receipts, units, or any combination thereof, from time to time during the 25-month period that the shelf prospectus is effective.
In May 2020, the Company completed a public offering in which it issued and sold 2,127,500 Class A subordinate voting shares at a public offering price of $700.00 per share, including 277,500 Class A subordinate voting shares purchased by the underwriters pursuant to the exercise of the over-allotment option. The Company received total net proceeds of $1,460.9 million after deducting offering fees and expenses of $28.3 million.
Our principal cash requirements are for working capital and capital expenditures. Excluding current deferred revenue, working capital at December 31, 2021 was $8,053.4 million. Given the ongoing cash generated from operations and our existing cash and cash equivalents, we believe there is sufficient liquidity to meet our current and planned financial obligations over the next 12 months. Our future financing requirements will depend on many factors including our growth rate, subscription renewal activity, the timing and extent of spending to support development of our platform, the expansion of sales and marketing activities, the macroeconomic conditions and overall levels of consumer spending on goods, and potential mergers, strategic investments and acquisitions activity. Although we currently are not a party to any material undisclosed agreement and do not have any understanding with any third parties with respect to potential material investments in, or material acquisitions of, businesses or technologies, we may enter into these types of arrangements in the future, which could also require us to seek additional equity or debt financing. Additional funds may not be available on terms favorable to us or at all.