EX-99.19a-1

MFS^® Intermediate High Income Fund

P.O. Box 505005

Louisville, KY 40233-5005

Notice to shareholders — Source of distribution

Distribution period	June-2021
Distribution amount per share	$0.01933

The following table sets forth the estimated amounts of the current distribution and the cumulative distributions paid this fiscal year to date from the following sources: net investment income, net realized short-term capital gains, net realized long-term capital gains and return of capital or other capital source. The fund’s fiscal year begins each December 1^st. All amounts are expressed per common share.

	Current distribution		% Breakdown of current distribution			Total cumulative distributions for the fiscal year to date		% Breakdown of the total cumulative distributions for the fiscal year to date
Net Investment Income	$	0.01179		61	%	$	0.08457		62	%
Net Realized ST Cap Gains		0.00000		0	%		0.00000		0	%
Net Realized LT Cap Gains		0.00000		0	%		0.00000		0	%
Return of Capital or Other Capital Source		0.00754		39	%		0.05184		38	%
Total (per common share)	$	0.01933		100	%	$	0.13641		100	%

Average annual total return (in relation to NAV) for the five years ended 5-31-2021	7.85	%
Annualized current distribution rate expressed as a percentage of month end NAV as of 5-31-2021	9.55	%
Cumulative total return (in relation to NAV) for the fiscal year through 5-31-2021	3.03	%
Cumulative fiscal year distributions as a percentage of NAV as of 5-31-2021	5.61	%

You should not draw any conclusions about the fund’s investment performance from the amount of this distribution or from the terms of the fund’s managed distribution plan.

The fund estimates that it has distributed more than its income and capital gains; therefore, a portion of your distribution may be a return of capital. A return of capital may occur, for example, when some or all of the money that you invested in the fund is paid back to you. A return of capital distribution does not necessarily reflect the fund’s investment performance and should not be confused with “yield” or “income.”

The amounts and sources of distributions reported in this notice are only estimates and are not being provided for tax-reporting purposes. The actual amounts and sources of the amounts for tax-reporting purposes will depend upon the fund’s investment experience during the remainder of its fiscal year and may be subject to changes based on tax regulations. The fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes. If you have any questions regarding this information, please call our fund service department at 1-800-637-2304 any business day from 9 a.m. to 5 p.m. Eastern time.

CIHSN-0621

MFS^® Intermediate High Income Fund

P.O. Box 505005

Louisville, KY 40233-5005

Notice to shareholders — Source of distribution

Distribution period	July-2021
Distribution amount per share	$0.01934

The following table sets forth the estimated amounts of the current distribution and the cumulative distributions paid this fiscal year to date from the following sources: net investment income, net realized short-term capital gains, net realized long-term capital gains and return of capital or other capital source. The fund’s fiscal year begins each December 1^st. All amounts are expressed per common share.

	Current distribution		% Breakdown of current distribution			Total cumulative distributions for the fiscal year to date		% Breakdown of the total cumulative distributions for the fiscal year to date
Net Investment Income	$	0.01141		59	%	$	0.09501		61	%
Net Realized ST Cap Gains		0.00000		0	%		0.00000		0	%
Net Realized LT Cap Gains		0.00000		0	%		0.00000		0	%
Return of Capital or Other Capital Source		0.00793		41	%		0.06074		39	%
Total (per common share)	$	0.01934		100	%	$	0.15575		100	%

Average annual total return (in relation to NAV) for the five years ended 6-30-2021	7.89	%
Annualized current distribution rate expressed as a percentage of month end NAV as of 6-30-2021	9.47	%
Cumulative total return (in relation to NAV) for the fiscal year through 6-30-2021	4.51	%
Cumulative fiscal year distributions as a percentage of NAV as of 6-30-2021	6.36	%

You should not draw any conclusions about the fund’s investment performance from the amount of this distribution or from the terms of the fund’s managed distribution plan.

The fund estimates that it has distributed more than its income and capital gains; therefore, a portion of your distribution may be a return of capital. A return of capital may occur, for example, when some or all of the money that you invested in the fund is paid back to you. A return of capital distribution does not necessarily reflect the fund’s investment performance and should not be confused with “yield” or “income.”

The amounts and sources of distributions reported in this notice are only estimates and are not being provided for tax-reporting purposes. The actual amounts and sources of the amounts for tax-reporting purposes will depend upon the fund’s investment experience during the remainder of its fiscal year and may be subject to changes based on tax regulations. The fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes. If you have any questions regarding this information, please call our fund service department at 1-800-637-2304 any business day from 9 a.m. to 5 p.m. Eastern time.

CIHSN-0721

MFS^® Intermediate High Income Fund

P.O. Box 505005

Louisville, KY 40233-5005

Notice to shareholders — Source of distribution

Distribution period	August-2021
Distribution amount per share	$0.01937

The following table sets forth the estimated amounts of the current distribution and the cumulative distributions paid this fiscal year to date from the following sources: net investment income, net realized short-term capital gains, net realized long-term capital gains and return of capital or other capital source. The fund’s fiscal year begins each December 1^st. All amounts are expressed per common share.

	Current distribution		% Breakdown of current distribution			Total cumulative distributions for the fiscal year to date		% Breakdown of the total cumulative distributions for the fiscal year to date
Net Investment Income	$	0.01104		57	%	$	0.10682		61	%
Net Realized ST Cap Gains		0.00000		0	%		0.00000		0	%
Net Realized LT Cap Gains		0.00000		0	%		0.00000		0	%
Return of Capital or Other Capital Source		0.00833		43	%		0.06830		39	%
Total (per common share)	$	0.01937		100	%	$	0.17512		100	%

Average annual total return (in relation to NAV) for the five years ended 7-31-2021	7.29	%
Annualized current distribution rate expressed as a percentage of month end NAV as of 7-31-2021	9.53	%
Cumulative total return (in relation to NAV) for the fiscal year through 7-31-2021	4.72	%
Cumulative fiscal year distributions as a percentage of NAV as of 7-31-2021	7.18	%

You should not draw any conclusions about the fund’s investment performance from the amount of this distribution or from the terms of the fund’s managed distribution plan.

The fund estimates that it has distributed more than its income and capital gains; therefore, a portion of your distribution may be a return of capital. A return of capital may occur, for example, when some or all of the money that you invested in the fund is paid back to you. A return of capital distribution does not necessarily reflect the fund’s investment performance and should not be confused with “yield” or “income.”

The amounts and sources of distributions reported in this notice are only estimates and are not being provided for tax-reporting purposes. The actual amounts and sources of the amounts for tax-reporting purposes will depend upon the fund’s investment experience during the remainder of its fiscal year and may be subject to changes based on tax regulations. The fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes. If you have any questions regarding this information, please call our fund service department at 1-800-637-2304 any business day from 9 a.m. to 5 p.m. Eastern time.

CIHSN-0821

MFS^® Intermediate High Income Fund

P.O. Box 505005

Louisville, KY 40233-5005

Notice to shareholders — Source of distribution

Distribution period	September-2021
Distribution amount per share	$0.01920

The following table sets forth the estimated amounts of the current distribution and the cumulative distributions paid this fiscal year to date from the following sources: net investment income, net realized short-term capital gains, net realized long-term capital gains and return of capital or other capital source. The fund’s fiscal year begins each December 1^st. All amounts are expressed per common share.

	Current distribution		% Breakdown of current distribution			Total cumulative distributions for the fiscal year to date		% Breakdown of the total cumulative distributions for the fiscal year to date
Net Investment Income	$	0.01094		57	%	$	0.11659		60	%
Net Realized ST Cap Gains		0.00000		0	%		0.00000		0	%
Net Realized LT Cap Gains		0.00000		0	%		0.00000		0	%
Return of Capital or Other Capital Source		0.00826		43	%		0.07773		40	%
Total (per common share)	$	0.01920		100	%	$	0.19432		100	%

Average annual total return (in relation to NAV) for the five years ended 8-31-2021	6.87	%
Annualized current distribution rate expressed as a percentage of month end NAV as of 8-31-2021	9.44	%
Cumulative total return (in relation to NAV) for the fiscal year through 8-31-2021	5.42	%
Cumulative fiscal year distributions as a percentage of NAV as of 8-31-2021	7.96	%

You should not draw any conclusions about the fund’s investment performance from the amount of this distribution or from the terms of the fund’s managed distribution plan.

The fund estimates that it has distributed more than its income and capital gains; therefore, a portion of your distribution may be a return of capital. A return of capital may occur, for example, when some or all of the money that you invested in the fund is paid back to you. A return of capital distribution does not necessarily reflect the fund’s investment performance and should not be confused with “yield” or “income.”

The amounts and sources of distributions reported in this notice are only estimates and are not being provided for tax-reporting purposes. The actual amounts and sources of the amounts for tax-reporting purposes will depend upon the fund’s investment experience during the remainder of its fiscal year and may be subject to changes based on tax regulations. The fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes. If you have any questions regarding this information, please call our fund service department at 1-800-637-2304 any business day from 9 a.m. to 5 p.m. Eastern time.

CIHSN-0921

MFS^® Intermediate High Income Fund

P.O. Box 505005

Louisville, KY 40233-5005

Notice to shareholders — Source of distribution

Distribution period	October-2021
Distribution amount per share	$0.01926

The following table sets forth the estimated amounts of the current distribution and the cumulative distributions paid this fiscal year to date from the following sources: net investment income, net realized short-term capital gains, net realized long-term capital gains and return of capital or other capital source. The fund’s fiscal year begins each December 1^st. All amounts are expressed per common share.

	Current distribution		% Breakdown of current distribution			Total cumulative distributions for the fiscal year to date		% Breakdown of the total cumulative distributions for the fiscal year to date
Net Investment Income	$	0.01156		60	%	$	0.12815		60	%
Net Realized ST Cap Gains		0.00000		0	%		0.00000		0	%
Net Realized LT Cap Gains		0.00000		0	%		0.00000		0	%
Return of Capital or Other Capital Source		0.00770		40	%		0.08543		40	%
Total (per common share)	$	0.01926		100	%	$	0.21358		100	%

Average annual total return (in relation to NAV) for the five years ended 9-30-2021	6.64	%
Annualized current distribution rate expressed as a percentage of month end NAV as of 9-30-2021	9.59	%
Cumulative total return (in relation to NAV) for the fiscal year through 9-30-2021	4.82	%
Cumulative fiscal year distributions as a percentage of NAV as of 9-30-2021	8.86	%

You should not draw any conclusions about the fund’s investment performance from the amount of this distribution or from the terms of the fund’s managed distribution plan.

The fund estimates that it has distributed more than its income and capital gains; therefore, a portion of your distribution may be a return of capital. A return of capital may occur, for example, when some or all of the money that you invested in the fund is paid back to you. A return of capital distribution does not necessarily reflect the fund’s investment performance and should not be confused with “yield” or “income.”

The amounts and sources of distributions reported in this notice are only estimates and are not being provided for tax-reporting purposes. The actual amounts and sources of the amounts for tax-reporting purposes will depend upon the fund’s investment experience during the remainder of its fiscal year and may be subject to changes based on tax regulations. The fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes. If you have any questions regarding this information, please call our fund service department at 1-800-637-2304 any business day from 9 a.m. to 5 p.m. Eastern time.

CIHSN-1021

MFS^® Intermediate High Income Fund

P.O. Box 505005

Louisville, KY 40233-5005

Notice to shareholders — Source of distribution

Distribution period	November-2021
Distribution amount per share	$0.01892

The following table sets forth the estimated amounts of the current distribution and the cumulative distributions paid this fiscal year to date from the following sources: net investment income, net realized short-term capital gains, net realized long-term capital gains and return of capital or other capital source. The fund’s fiscal year begins each December 1^st. All amounts are expressed per common share.

	Current distribution		% Breakdown of current distribution			Total cumulative distributions for the fiscal year to date		% Breakdown of the total cumulative distributions for the fiscal year to date
Net Investment Income	$	0.01135		60	%	$	0.13950		60	%
Net Realized ST Cap Gains		0.00000		0	%		0.00000		0	%
Net Realized LT Cap Gains		0.00000		0	%		0.00000		0	%
Return of Capital or Other Capital Source		0.00757		40	%		0.09300		40	%
Total (per common share)	$	0.01892		100	%	$	0.23250		100	%

Average annual total return (in relation to NAV) for the five years ended 10-31-2021	6.40	%
Annualized current distribution rate expressed as a percentage of month end NAV as of 10-31-2021	9.54	%
Cumulative total return (in relation to NAV) for the fiscal year through 10-31-2021	4.19	%
Cumulative fiscal year distributions as a percentage of NAV as of 10-31-2021	9.77	%

You should not draw any conclusions about the fund’s investment performance from the amount of this distribution or from the terms of the fund’s managed distribution plan.

The fund estimates that it has distributed more than its income and capital gains; therefore, a portion of your distribution may be a return of capital. A return of capital may occur, for example, when some or all of the money that you invested in the fund is paid back to you. A return of capital distribution does not necessarily reflect the fund’s investment performance and should not be confused with “yield” or “income.”

The amounts and sources of distributions reported in this notice are only estimates and are not being provided for tax-reporting purposes. The actual amounts and sources of the amounts for tax-reporting purposes will depend upon the fund’s investment experience during the remainder of its fiscal year and may be subject to changes based on tax regulations. The fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes. If you have any questions regarding this information, please call our fund service department at 1-800-637-2304 any business day from 9 a.m. to 5 p.m. Eastern time.

CIHSN-1121